A:
Positive:
1 x 202512317 x 289303311 x 184102113 x 155778777 x 26300391 x 222541143 x 1416171001 x 20231
Negative:
-1 x -20251231-7 x -2893033-11 x -1841021-13 x -1557787-77 x -263003-91 x -222541-143 x -141617-1001 x -20231
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 20,251,231, 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 | 20,251,231 | |
| -1 | -20,251,231 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,251,231.
Example:
1 x 20,251,231 = 20,251,231
and
-1 x -20,251,231 = 20,251,231
Notice both answers equal 20,251,231
With that explanation out of the way, let's continue. Next, we take the number 20,251,231 and divide it by 2:
20,251,231 ÷ 2 = 10,125,615.5
If the quotient is a whole number, then 2 and 10,125,615.5 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 | 20,251,231 | |
| -1 | -20,251,231 |
Now, we try dividing 20,251,231 by 3:
20,251,231 ÷ 3 = 6,750,410.3333
If the quotient is a whole number, then 3 and 6,750,410.3333 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 | 20,251,231 | |
| -1 | -20,251,231 |
Let's try dividing by 4:
20,251,231 ÷ 4 = 5,062,807.75
If the quotient is a whole number, then 4 and 5,062,807.75 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 | 20,251,231 | |
| -1 | 20,251,231 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 13 | 77 | 91 | 143 | 1,001 | 20,231 | 141,617 | 222,541 | 263,003 | 1,557,787 | 1,841,021 | 2,893,033 | 20,251,231 |
| -1 | -7 | -11 | -13 | -77 | -91 | -143 | -1,001 | -20,231 | -141,617 | -222,541 | -263,003 | -1,557,787 | -1,841,021 | -2,893,033 | -20,251,231 |
Here are some more numbers to try:
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