A:
Positive:
1 x 206718855 x 413437713 x 159014531 x 66683565 x 318029155 x 133367403 x 512952015 x 10259
Negative:
-1 x -20671885-5 x -4134377-13 x -1590145-31 x -666835-65 x -318029-155 x -133367-403 x -51295-2015 x -10259
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 20,671,885, 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 | 20,671,885 | |
| -1 | -20,671,885 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,671,885.
Example:
1 x 20,671,885 = 20,671,885
and
-1 x -20,671,885 = 20,671,885
Notice both answers equal 20,671,885
With that explanation out of the way, let's continue. Next, we take the number 20,671,885 and divide it by 2:
20,671,885 ÷ 2 = 10,335,942.5
If the quotient is a whole number, then 2 and 10,335,942.5 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 | 20,671,885 | |
| -1 | -20,671,885 |
Now, we try dividing 20,671,885 by 3:
20,671,885 ÷ 3 = 6,890,628.3333
If the quotient is a whole number, then 3 and 6,890,628.3333 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 | 20,671,885 | |
| -1 | -20,671,885 |
Let's try dividing by 4:
20,671,885 ÷ 4 = 5,167,971.25
If the quotient is a whole number, then 4 and 5,167,971.25 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 | 20,671,885 | |
| -1 | 20,671,885 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 31 | 65 | 155 | 403 | 2,015 | 10,259 | 51,295 | 133,367 | 318,029 | 666,835 | 1,590,145 | 4,134,377 | 20,671,885 |
| -1 | -5 | -13 | -31 | -65 | -155 | -403 | -2,015 | -10,259 | -51,295 | -133,367 | -318,029 | -666,835 | -1,590,145 | -4,134,377 | -20,671,885 |
Here are some more numbers to try:
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