Q: What are the factor combinations of the number 20,801,820?

 A:
Positive:   1 x 208018202 x 104009103 x 69339404 x 52004555 x 41603646 x 346697010 x 208018212 x 173348513 x 160014015 x 138678820 x 104009126 x 80007030 x 69339439 x 53338052 x 40003560 x 34669765 x 32002878 x 266690130 x 160014156 x 133345195 x 106676260 x 80007390 x 53338780 x 26669
Negative: -1 x -20801820-2 x -10400910-3 x -6933940-4 x -5200455-5 x -4160364-6 x -3466970-10 x -2080182-12 x -1733485-13 x -1600140-15 x -1386788-20 x -1040091-26 x -800070-30 x -693394-39 x -533380-52 x -400035-60 x -346697-65 x -320028-78 x -266690-130 x -160014-156 x -133345-195 x -106676-260 x -80007-390 x -53338-780 x -26669


How do I find the factor combinations of the number 20,801,820?

Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 20,801,820, it is easier to work with a table - it's called factoring from the outside in.

Outside in Factoring

We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.

1 20,801,820
-1 -20,801,820

Why are the negative numbers included?

When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,801,820.

Example:
1 x 20,801,820 = 20,801,820
and
-1 x -20,801,820 = 20,801,820
Notice both answers equal 20,801,820

With that explanation out of the way, let's continue. Next, we take the number 20,801,820 and divide it by 2:

20,801,820 ÷ 2 = 10,400,910

If the quotient is a whole number, then 2 and 10,400,910 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 10,400,910 20,801,820
-1 -2 -10,400,910 -20,801,820

Now, we try dividing 20,801,820 by 3:

20,801,820 ÷ 3 = 6,933,940

If the quotient is a whole number, then 3 and 6,933,940 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 3 6,933,940 10,400,910 20,801,820
-1 -2 -3 -6,933,940 -10,400,910 -20,801,820

Let's try dividing by 4:

20,801,820 ÷ 4 = 5,200,455

If the quotient is a whole number, then 4 and 5,200,455 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 3 4 5,200,455 6,933,940 10,400,910 20,801,820
-1 -2 -3 -4 -5,200,455 -6,933,940 -10,400,910 20,801,820
Keep dividing by the next highest number until you cannot divide anymore.

If you did it right, you will end up with this table:

12345610121315202630395260657813015619526039078026,66953,33880,007106,676133,345160,014266,690320,028346,697400,035533,380693,394800,0701,040,0911,386,7881,600,1401,733,4852,080,1823,466,9704,160,3645,200,4556,933,94010,400,91020,801,820
-1-2-3-4-5-6-10-12-13-15-20-26-30-39-52-60-65-78-130-156-195-260-390-780-26,669-53,338-80,007-106,676-133,345-160,014-266,690-320,028-346,697-400,035-533,380-693,394-800,070-1,040,091-1,386,788-1,600,140-1,733,485-2,080,182-3,466,970-4,160,364-5,200,455-6,933,940-10,400,910-20,801,820

More Examples

Here are some more numbers to try:

20,801,81820,801,81920,801,82120,801,822
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