A:
Positive:
1 x 131452097 x 187788711 x 119501931 x 42403977 x 170717217 x 60577341 x 385492387 x 5507
Negative:
-1 x -13145209-7 x -1877887-11 x -1195019-31 x -424039-77 x -170717-217 x -60577-341 x -38549-2387 x -5507
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 13,145,209, 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 | 13,145,209 | |
| -1 | -13,145,209 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 13,145,209.
Example:
1 x 13,145,209 = 13,145,209
and
-1 x -13,145,209 = 13,145,209
Notice both answers equal 13,145,209
With that explanation out of the way, let's continue. Next, we take the number 13,145,209 and divide it by 2:
13,145,209 ÷ 2 = 6,572,604.5
If the quotient is a whole number, then 2 and 6,572,604.5 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 | 13,145,209 | |
| -1 | -13,145,209 |
Now, we try dividing 13,145,209 by 3:
13,145,209 ÷ 3 = 4,381,736.3333
If the quotient is a whole number, then 3 and 4,381,736.3333 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 | 13,145,209 | |
| -1 | -13,145,209 |
Let's try dividing by 4:
13,145,209 ÷ 4 = 3,286,302.25
If the quotient is a whole number, then 4 and 3,286,302.25 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 | 13,145,209 | |
| -1 | 13,145,209 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 31 | 77 | 217 | 341 | 2,387 | 5,507 | 38,549 | 60,577 | 170,717 | 424,039 | 1,195,019 | 1,877,887 | 13,145,209 |
| -1 | -7 | -11 | -31 | -77 | -217 | -341 | -2,387 | -5,507 | -38,549 | -60,577 | -170,717 | -424,039 | -1,195,019 | -1,877,887 | -13,145,209 |
Here are some more numbers to try:
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