A:
Positive:
1 x 201022155 x 40204437 x 287174535 x 574349499 x 402851151 x 174652495 x 80573493 x 5755
Negative:
-1 x -20102215-5 x -4020443-7 x -2871745-35 x -574349-499 x -40285-1151 x -17465-2495 x -8057-3493 x -5755
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 20,102,215, 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 | 20,102,215 | |
| -1 | -20,102,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,102,215.
Example:
1 x 20,102,215 = 20,102,215
and
-1 x -20,102,215 = 20,102,215
Notice both answers equal 20,102,215
With that explanation out of the way, let's continue. Next, we take the number 20,102,215 and divide it by 2:
20,102,215 ÷ 2 = 10,051,107.5
If the quotient is a whole number, then 2 and 10,051,107.5 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 | 20,102,215 | |
| -1 | -20,102,215 |
Now, we try dividing 20,102,215 by 3:
20,102,215 ÷ 3 = 6,700,738.3333
If the quotient is a whole number, then 3 and 6,700,738.3333 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 | 20,102,215 | |
| -1 | -20,102,215 |
Let's try dividing by 4:
20,102,215 ÷ 4 = 5,025,553.75
If the quotient is a whole number, then 4 and 5,025,553.75 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 | 20,102,215 | |
| -1 | 20,102,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 499 | 1,151 | 2,495 | 3,493 | 5,755 | 8,057 | 17,465 | 40,285 | 574,349 | 2,871,745 | 4,020,443 | 20,102,215 |
| -1 | -5 | -7 | -35 | -499 | -1,151 | -2,495 | -3,493 | -5,755 | -8,057 | -17,465 | -40,285 | -574,349 | -2,871,745 | -4,020,443 | -20,102,215 |
Here are some more numbers to try:
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