A:
Positive:
1 x 2180761713 x 167750917 x 1282801101 x 215917221 x 98677977 x 223211313 x 166091717 x 12701
Negative:
-1 x -21807617-13 x -1677509-17 x -1282801-101 x -215917-221 x -98677-977 x -22321-1313 x -16609-1717 x -12701
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 21,807,617, 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 | 21,807,617 | |
| -1 | -21,807,617 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,807,617.
Example:
1 x 21,807,617 = 21,807,617
and
-1 x -21,807,617 = 21,807,617
Notice both answers equal 21,807,617
With that explanation out of the way, let's continue. Next, we take the number 21,807,617 and divide it by 2:
21,807,617 ÷ 2 = 10,903,808.5
If the quotient is a whole number, then 2 and 10,903,808.5 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 | 21,807,617 | |
| -1 | -21,807,617 |
Now, we try dividing 21,807,617 by 3:
21,807,617 ÷ 3 = 7,269,205.6667
If the quotient is a whole number, then 3 and 7,269,205.6667 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 | 21,807,617 | |
| -1 | -21,807,617 |
Let's try dividing by 4:
21,807,617 ÷ 4 = 5,451,904.25
If the quotient is a whole number, then 4 and 5,451,904.25 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 | 21,807,617 | |
| -1 | 21,807,617 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 101 | 221 | 977 | 1,313 | 1,717 | 12,701 | 16,609 | 22,321 | 98,677 | 215,917 | 1,282,801 | 1,677,509 | 21,807,617 |
| -1 | -13 | -17 | -101 | -221 | -977 | -1,313 | -1,717 | -12,701 | -16,609 | -22,321 | -98,677 | -215,917 | -1,282,801 | -1,677,509 | -21,807,617 |
Here are some more numbers to try:
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