Q: What are the factor combinations of the number 20,021,900?

 A:
Positive:   1 x 200219002 x 100109504 x 50054755 x 400438010 x 200219020 x 100109525 x 80087650 x 400438100 x 200219347 x 57700577 x 34700694 x 288501154 x 173501388 x 144251735 x 115402308 x 86752885 x 69403470 x 5770
Negative: -1 x -20021900-2 x -10010950-4 x -5005475-5 x -4004380-10 x -2002190-20 x -1001095-25 x -800876-50 x -400438-100 x -200219-347 x -57700-577 x -34700-694 x -28850-1154 x -17350-1388 x -14425-1735 x -11540-2308 x -8675-2885 x -6940-3470 x -5770


How do I find the factor combinations of the number 20,021,900?

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 20,021,900, 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 20,021,900
-1 -20,021,900

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 20,021,900.

Example:
1 x 20,021,900 = 20,021,900
and
-1 x -20,021,900 = 20,021,900
Notice both answers equal 20,021,900

With that explanation out of the way, let's continue. Next, we take the number 20,021,900 and divide it by 2:

20,021,900 ÷ 2 = 10,010,950

If the quotient is a whole number, then 2 and 10,010,950 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 10,010,950 20,021,900
-1 -2 -10,010,950 -20,021,900

Now, we try dividing 20,021,900 by 3:

20,021,900 ÷ 3 = 6,673,966.6667

If the quotient is a whole number, then 3 and 6,673,966.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.

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

1 2 10,010,950 20,021,900
-1 -2 -10,010,950 -20,021,900

Let's try dividing by 4:

20,021,900 ÷ 4 = 5,005,475

If the quotient is a whole number, then 4 and 5,005,475 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 4 5,005,475 10,010,950 20,021,900
-1 -2 -4 -5,005,475 -10,010,950 20,021,900
Keep dividing by the next highest number until you cannot divide anymore.

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

1245102025501003475776941,1541,3881,7352,3082,8853,4705,7706,9408,67511,54014,42517,35028,85034,70057,700200,219400,438800,8761,001,0952,002,1904,004,3805,005,47510,010,95020,021,900
-1-2-4-5-10-20-25-50-100-347-577-694-1,154-1,388-1,735-2,308-2,885-3,470-5,770-6,940-8,675-11,540-14,425-17,350-28,850-34,700-57,700-200,219-400,438-800,876-1,001,095-2,002,190-4,004,380-5,005,475-10,010,950-20,021,900

More Examples

Here are some more numbers to try:

20,021,89820,021,89920,021,90120,021,902
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