A:
Positive:
1 x 206516455 x 41303297 x 295023535 x 59004783 x 248815415 x 49763581 x 355452905 x 7109
Negative:
-1 x -20651645-5 x -4130329-7 x -2950235-35 x -590047-83 x -248815-415 x -49763-581 x -35545-2905 x -7109
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 20,651,645, it is easier to work with a table - it's called factoring from the outside in.
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 | 20,651,645 | |
| -1 | -20,651,645 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,651,645.
Example:
1 x 20,651,645 = 20,651,645
and
-1 x -20,651,645 = 20,651,645
Notice both answers equal 20,651,645
With that explanation out of the way, let's continue. Next, we take the number 20,651,645 and divide it by 2:
20,651,645 ÷ 2 = 10,325,822.5
If the quotient is a whole number, then 2 and 10,325,822.5 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 | 20,651,645 | |
| -1 | -20,651,645 |
Now, we try dividing 20,651,645 by 3:
20,651,645 ÷ 3 = 6,883,881.6667
If the quotient is a whole number, then 3 and 6,883,881.6667 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 | 20,651,645 | |
| -1 | -20,651,645 |
Let's try dividing by 4:
20,651,645 ÷ 4 = 5,162,911.25
If the quotient is a whole number, then 4 and 5,162,911.25 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 | 20,651,645 | |
| -1 | 20,651,645 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 83 | 415 | 581 | 2,905 | 7,109 | 35,545 | 49,763 | 248,815 | 590,047 | 2,950,235 | 4,130,329 | 20,651,645 |
| -1 | -5 | -7 | -35 | -83 | -415 | -581 | -2,905 | -7,109 | -35,545 | -49,763 | -248,815 | -590,047 | -2,950,235 | -4,130,329 | -20,651,645 |
Here are some more numbers to try:
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