A:
Positive:
1 x 204892317 x 292703337 x 553763239 x 85729259 x 79109331 x 619011673 x 122472317 x 8843
Negative:
-1 x -20489231-7 x -2927033-37 x -553763-239 x -85729-259 x -79109-331 x -61901-1673 x -12247-2317 x -8843
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 20,489,231, 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 | 20,489,231 | |
| -1 | -20,489,231 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,489,231.
Example:
1 x 20,489,231 = 20,489,231
and
-1 x -20,489,231 = 20,489,231
Notice both answers equal 20,489,231
With that explanation out of the way, let's continue. Next, we take the number 20,489,231 and divide it by 2:
20,489,231 ÷ 2 = 10,244,615.5
If the quotient is a whole number, then 2 and 10,244,615.5 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 | 20,489,231 | |
| -1 | -20,489,231 |
Now, we try dividing 20,489,231 by 3:
20,489,231 ÷ 3 = 6,829,743.6667
If the quotient is a whole number, then 3 and 6,829,743.6667 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 | 20,489,231 | |
| -1 | -20,489,231 |
Let's try dividing by 4:
20,489,231 ÷ 4 = 5,122,307.75
If the quotient is a whole number, then 4 and 5,122,307.75 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 | 20,489,231 | |
| -1 | 20,489,231 |
If you did it right, you will end up with this table:
| 1 | 7 | 37 | 239 | 259 | 331 | 1,673 | 2,317 | 8,843 | 12,247 | 61,901 | 79,109 | 85,729 | 553,763 | 2,927,033 | 20,489,231 |
| -1 | -7 | -37 | -239 | -259 | -331 | -1,673 | -2,317 | -8,843 | -12,247 | -61,901 | -79,109 | -85,729 | -553,763 | -2,927,033 | -20,489,231 |
Here are some more numbers to try:
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