A:
Positive:
1 x 207314055 x 414628131 x 668755131 x 158255155 x 133751655 x 316511021 x 203054061 x 5105
Negative:
-1 x -20731405-5 x -4146281-31 x -668755-131 x -158255-155 x -133751-655 x -31651-1021 x -20305-4061 x -5105
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 20,731,405, 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 | 20,731,405 | |
| -1 | -20,731,405 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,731,405.
Example:
1 x 20,731,405 = 20,731,405
and
-1 x -20,731,405 = 20,731,405
Notice both answers equal 20,731,405
With that explanation out of the way, let's continue. Next, we take the number 20,731,405 and divide it by 2:
20,731,405 ÷ 2 = 10,365,702.5
If the quotient is a whole number, then 2 and 10,365,702.5 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 | 20,731,405 | |
| -1 | -20,731,405 |
Now, we try dividing 20,731,405 by 3:
20,731,405 ÷ 3 = 6,910,468.3333
If the quotient is a whole number, then 3 and 6,910,468.3333 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 | 20,731,405 | |
| -1 | -20,731,405 |
Let's try dividing by 4:
20,731,405 ÷ 4 = 5,182,851.25
If the quotient is a whole number, then 4 and 5,182,851.25 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 | 20,731,405 | |
| -1 | 20,731,405 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 131 | 155 | 655 | 1,021 | 4,061 | 5,105 | 20,305 | 31,651 | 133,751 | 158,255 | 668,755 | 4,146,281 | 20,731,405 |
| -1 | -5 | -31 | -131 | -155 | -655 | -1,021 | -4,061 | -5,105 | -20,305 | -31,651 | -133,751 | -158,255 | -668,755 | -4,146,281 | -20,731,405 |
Here are some more numbers to try:
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