A:
Positive:
1 x 20556502129 x 708844941 x 501378183 x 24766871189 x 1728892083 x 986872407 x 854033403 x 60407
Negative:
-1 x -205565021-29 x -7088449-41 x -5013781-83 x -2476687-1189 x -172889-2083 x -98687-2407 x -85403-3403 x -60407
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 205,565,021, 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 | 205,565,021 | |
| -1 | -205,565,021 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 205,565,021.
Example:
1 x 205,565,021 = 205,565,021
and
-1 x -205,565,021 = 205,565,021
Notice both answers equal 205,565,021
With that explanation out of the way, let's continue. Next, we take the number 205,565,021 and divide it by 2:
205,565,021 ÷ 2 = 102,782,510.5
If the quotient is a whole number, then 2 and 102,782,510.5 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 | 205,565,021 | |
| -1 | -205,565,021 |
Now, we try dividing 205,565,021 by 3:
205,565,021 ÷ 3 = 68,521,673.6667
If the quotient is a whole number, then 3 and 68,521,673.6667 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 | 205,565,021 | |
| -1 | -205,565,021 |
Let's try dividing by 4:
205,565,021 ÷ 4 = 51,391,255.25
If the quotient is a whole number, then 4 and 51,391,255.25 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 | 205,565,021 | |
| -1 | 205,565,021 |
If you did it right, you will end up with this table:
| 1 | 29 | 41 | 83 | 1,189 | 2,083 | 2,407 | 3,403 | 60,407 | 85,403 | 98,687 | 172,889 | 2,476,687 | 5,013,781 | 7,088,449 | 205,565,021 |
| -1 | -29 | -41 | -83 | -1,189 | -2,083 | -2,407 | -3,403 | -60,407 | -85,403 | -98,687 | -172,889 | -2,476,687 | -5,013,781 | -7,088,449 | -205,565,021 |
Here are some more numbers to try:
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