A:
Positive:
1 x 20715130711 x 1883193717 x 12185371187 x 1107761739 x 2803131499 x 1381938129 x 2548312563 x 16489
Negative:
-1 x -207151307-11 x -18831937-17 x -12185371-187 x -1107761-739 x -280313-1499 x -138193-8129 x -25483-12563 x -16489
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 207,151,307, 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 | 207,151,307 | |
| -1 | -207,151,307 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 207,151,307.
Example:
1 x 207,151,307 = 207,151,307
and
-1 x -207,151,307 = 207,151,307
Notice both answers equal 207,151,307
With that explanation out of the way, let's continue. Next, we take the number 207,151,307 and divide it by 2:
207,151,307 ÷ 2 = 103,575,653.5
If the quotient is a whole number, then 2 and 103,575,653.5 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 | 207,151,307 | |
| -1 | -207,151,307 |
Now, we try dividing 207,151,307 by 3:
207,151,307 ÷ 3 = 69,050,435.6667
If the quotient is a whole number, then 3 and 69,050,435.6667 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 | 207,151,307 | |
| -1 | -207,151,307 |
Let's try dividing by 4:
207,151,307 ÷ 4 = 51,787,826.75
If the quotient is a whole number, then 4 and 51,787,826.75 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 | 207,151,307 | |
| -1 | 207,151,307 |
If you did it right, you will end up with this table:
| 1 | 11 | 17 | 187 | 739 | 1,499 | 8,129 | 12,563 | 16,489 | 25,483 | 138,193 | 280,313 | 1,107,761 | 12,185,371 | 18,831,937 | 207,151,307 |
| -1 | -11 | -17 | -187 | -739 | -1,499 | -8,129 | -12,563 | -16,489 | -25,483 | -138,193 | -280,313 | -1,107,761 | -12,185,371 | -18,831,937 | -207,151,307 |
Here are some more numbers to try:
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