A:
Positive:
1 x 203213997 x 290305731 x 65552937 x 549227217 x 93647259 x 784611147 x 177172531 x 8029
Negative:
-1 x -20321399-7 x -2903057-31 x -655529-37 x -549227-217 x -93647-259 x -78461-1147 x -17717-2531 x -8029
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 20,321,399, 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 | 20,321,399 | |
| -1 | -20,321,399 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,321,399.
Example:
1 x 20,321,399 = 20,321,399
and
-1 x -20,321,399 = 20,321,399
Notice both answers equal 20,321,399
With that explanation out of the way, let's continue. Next, we take the number 20,321,399 and divide it by 2:
20,321,399 ÷ 2 = 10,160,699.5
If the quotient is a whole number, then 2 and 10,160,699.5 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 | 20,321,399 | |
| -1 | -20,321,399 |
Now, we try dividing 20,321,399 by 3:
20,321,399 ÷ 3 = 6,773,799.6667
If the quotient is a whole number, then 3 and 6,773,799.6667 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 | 20,321,399 | |
| -1 | -20,321,399 |
Let's try dividing by 4:
20,321,399 ÷ 4 = 5,080,349.75
If the quotient is a whole number, then 4 and 5,080,349.75 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 | 20,321,399 | |
| -1 | 20,321,399 |
If you did it right, you will end up with this table:
| 1 | 7 | 31 | 37 | 217 | 259 | 1,147 | 2,531 | 8,029 | 17,717 | 78,461 | 93,647 | 549,227 | 655,529 | 2,903,057 | 20,321,399 |
| -1 | -7 | -31 | -37 | -217 | -259 | -1,147 | -2,531 | -8,029 | -17,717 | -78,461 | -93,647 | -549,227 | -655,529 | -2,903,057 | -20,321,399 |
Here are some more numbers to try:
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