A:
Positive:
1 x 152478955 x 304957913 x 117291517 x 89693565 x 23458385 x 179387221 x 689951105 x 13799
Negative:
-1 x -15247895-5 x -3049579-13 x -1172915-17 x -896935-65 x -234583-85 x -179387-221 x -68995-1105 x -13799
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 15,247,895, 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 | 15,247,895 | |
| -1 | -15,247,895 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,247,895.
Example:
1 x 15,247,895 = 15,247,895
and
-1 x -15,247,895 = 15,247,895
Notice both answers equal 15,247,895
With that explanation out of the way, let's continue. Next, we take the number 15,247,895 and divide it by 2:
15,247,895 ÷ 2 = 7,623,947.5
If the quotient is a whole number, then 2 and 7,623,947.5 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 | 15,247,895 | |
| -1 | -15,247,895 |
Now, we try dividing 15,247,895 by 3:
15,247,895 ÷ 3 = 5,082,631.6667
If the quotient is a whole number, then 3 and 5,082,631.6667 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 | 15,247,895 | |
| -1 | -15,247,895 |
Let's try dividing by 4:
15,247,895 ÷ 4 = 3,811,973.75
If the quotient is a whole number, then 4 and 3,811,973.75 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 | 15,247,895 | |
| -1 | 15,247,895 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 17 | 65 | 85 | 221 | 1,105 | 13,799 | 68,995 | 179,387 | 234,583 | 896,935 | 1,172,915 | 3,049,579 | 15,247,895 |
| -1 | -5 | -13 | -17 | -65 | -85 | -221 | -1,105 | -13,799 | -68,995 | -179,387 | -234,583 | -896,935 | -1,172,915 | -3,049,579 | -15,247,895 |
Here are some more numbers to try:
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