A:
Positive:
1 x 12089191317 x 711128937 x 326734971 x 1702703629 x 1921971207 x 1001592627 x 460192707 x 44659
Negative:
-1 x -120891913-17 x -7111289-37 x -3267349-71 x -1702703-629 x -192197-1207 x -100159-2627 x -46019-2707 x -44659
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 120,891,913, 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 | 120,891,913 | |
| -1 | -120,891,913 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 120,891,913.
Example:
1 x 120,891,913 = 120,891,913
and
-1 x -120,891,913 = 120,891,913
Notice both answers equal 120,891,913
With that explanation out of the way, let's continue. Next, we take the number 120,891,913 and divide it by 2:
120,891,913 ÷ 2 = 60,445,956.5
If the quotient is a whole number, then 2 and 60,445,956.5 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 | 120,891,913 | |
| -1 | -120,891,913 |
Now, we try dividing 120,891,913 by 3:
120,891,913 ÷ 3 = 40,297,304.3333
If the quotient is a whole number, then 3 and 40,297,304.3333 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 | 120,891,913 | |
| -1 | -120,891,913 |
Let's try dividing by 4:
120,891,913 ÷ 4 = 30,222,978.25
If the quotient is a whole number, then 4 and 30,222,978.25 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 | 120,891,913 | |
| -1 | 120,891,913 |
If you did it right, you will end up with this table:
| 1 | 17 | 37 | 71 | 629 | 1,207 | 2,627 | 2,707 | 44,659 | 46,019 | 100,159 | 192,197 | 1,702,703 | 3,267,349 | 7,111,289 | 120,891,913 |
| -1 | -17 | -37 | -71 | -629 | -1,207 | -2,627 | -2,707 | -44,659 | -46,019 | -100,159 | -192,197 | -1,702,703 | -3,267,349 | -7,111,289 | -120,891,913 |
Here are some more numbers to try:
Try the factor calculator