A:
Positive:
1 x 219207177 x 313153113 x 168620991 x 240887139 x 157703973 x 225291733 x 126491807 x 12131
Negative:
-1 x -21920717-7 x -3131531-13 x -1686209-91 x -240887-139 x -157703-973 x -22529-1733 x -12649-1807 x -12131
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 21,920,717, 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 | 21,920,717 | |
| -1 | -21,920,717 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,920,717.
Example:
1 x 21,920,717 = 21,920,717
and
-1 x -21,920,717 = 21,920,717
Notice both answers equal 21,920,717
With that explanation out of the way, let's continue. Next, we take the number 21,920,717 and divide it by 2:
21,920,717 ÷ 2 = 10,960,358.5
If the quotient is a whole number, then 2 and 10,960,358.5 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 | 21,920,717 | |
| -1 | -21,920,717 |
Now, we try dividing 21,920,717 by 3:
21,920,717 ÷ 3 = 7,306,905.6667
If the quotient is a whole number, then 3 and 7,306,905.6667 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 | 21,920,717 | |
| -1 | -21,920,717 |
Let's try dividing by 4:
21,920,717 ÷ 4 = 5,480,179.25
If the quotient is a whole number, then 4 and 5,480,179.25 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 | 21,920,717 | |
| -1 | 21,920,717 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 139 | 973 | 1,733 | 1,807 | 12,131 | 12,649 | 22,529 | 157,703 | 240,887 | 1,686,209 | 3,131,531 | 21,920,717 |
| -1 | -7 | -13 | -91 | -139 | -973 | -1,733 | -1,807 | -12,131 | -12,649 | -22,529 | -157,703 | -240,887 | -1,686,209 | -3,131,531 | -21,920,717 |
Here are some more numbers to try:
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