A:
Positive:
1 x 207171355 x 414342717 x 121865523 x 90074585 x 243731115 x 180149391 x 529851955 x 10597
Negative:
-1 x -20717135-5 x -4143427-17 x -1218655-23 x -900745-85 x -243731-115 x -180149-391 x -52985-1955 x -10597
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 20,717,135, 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 | 20,717,135 | |
| -1 | -20,717,135 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,717,135.
Example:
1 x 20,717,135 = 20,717,135
and
-1 x -20,717,135 = 20,717,135
Notice both answers equal 20,717,135
With that explanation out of the way, let's continue. Next, we take the number 20,717,135 and divide it by 2:
20,717,135 ÷ 2 = 10,358,567.5
If the quotient is a whole number, then 2 and 10,358,567.5 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 | 20,717,135 | |
| -1 | -20,717,135 |
Now, we try dividing 20,717,135 by 3:
20,717,135 ÷ 3 = 6,905,711.6667
If the quotient is a whole number, then 3 and 6,905,711.6667 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 | 20,717,135 | |
| -1 | -20,717,135 |
Let's try dividing by 4:
20,717,135 ÷ 4 = 5,179,283.75
If the quotient is a whole number, then 4 and 5,179,283.75 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 | 20,717,135 | |
| -1 | 20,717,135 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 23 | 85 | 115 | 391 | 1,955 | 10,597 | 52,985 | 180,149 | 243,731 | 900,745 | 1,218,655 | 4,143,427 | 20,717,135 |
| -1 | -5 | -17 | -23 | -85 | -115 | -391 | -1,955 | -10,597 | -52,985 | -180,149 | -243,731 | -900,745 | -1,218,655 | -4,143,427 | -20,717,135 |
Here are some more numbers to try:
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