A:
Positive:
1 x 102152155 x 204304317 x 60089547 x 21734585 x 120179235 x 43469799 x 127852557 x 3995
Negative:
-1 x -10215215-5 x -2043043-17 x -600895-47 x -217345-85 x -120179-235 x -43469-799 x -12785-2557 x -3995
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 10,215,215, 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 | 10,215,215 | |
| -1 | -10,215,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 10,215,215.
Example:
1 x 10,215,215 = 10,215,215
and
-1 x -10,215,215 = 10,215,215
Notice both answers equal 10,215,215
With that explanation out of the way, let's continue. Next, we take the number 10,215,215 and divide it by 2:
10,215,215 ÷ 2 = 5,107,607.5
If the quotient is a whole number, then 2 and 5,107,607.5 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 | 10,215,215 | |
| -1 | -10,215,215 |
Now, we try dividing 10,215,215 by 3:
10,215,215 ÷ 3 = 3,405,071.6667
If the quotient is a whole number, then 3 and 3,405,071.6667 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 | 10,215,215 | |
| -1 | -10,215,215 |
Let's try dividing by 4:
10,215,215 ÷ 4 = 2,553,803.75
If the quotient is a whole number, then 4 and 2,553,803.75 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 | 10,215,215 | |
| -1 | 10,215,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 47 | 85 | 235 | 799 | 2,557 | 3,995 | 12,785 | 43,469 | 120,179 | 217,345 | 600,895 | 2,043,043 | 10,215,215 |
| -1 | -5 | -17 | -47 | -85 | -235 | -799 | -2,557 | -3,995 | -12,785 | -43,469 | -120,179 | -217,345 | -600,895 | -2,043,043 | -10,215,215 |
Here are some more numbers to try:
Try the factor calculator