A:
Positive:
1 x 213207477 x 304582123 x 926989151 x 141197161 x 132427877 x 243111057 x 201713473 x 6139
Negative:
-1 x -21320747-7 x -3045821-23 x -926989-151 x -141197-161 x -132427-877 x -24311-1057 x -20171-3473 x -6139
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 21,320,747, 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 | 21,320,747 | |
| -1 | -21,320,747 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,320,747.
Example:
1 x 21,320,747 = 21,320,747
and
-1 x -21,320,747 = 21,320,747
Notice both answers equal 21,320,747
With that explanation out of the way, let's continue. Next, we take the number 21,320,747 and divide it by 2:
21,320,747 ÷ 2 = 10,660,373.5
If the quotient is a whole number, then 2 and 10,660,373.5 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 | 21,320,747 | |
| -1 | -21,320,747 |
Now, we try dividing 21,320,747 by 3:
21,320,747 ÷ 3 = 7,106,915.6667
If the quotient is a whole number, then 3 and 7,106,915.6667 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 | 21,320,747 | |
| -1 | -21,320,747 |
Let's try dividing by 4:
21,320,747 ÷ 4 = 5,330,186.75
If the quotient is a whole number, then 4 and 5,330,186.75 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 | 21,320,747 | |
| -1 | 21,320,747 |
If you did it right, you will end up with this table:
| 1 | 7 | 23 | 151 | 161 | 877 | 1,057 | 3,473 | 6,139 | 20,171 | 24,311 | 132,427 | 141,197 | 926,989 | 3,045,821 | 21,320,747 |
| -1 | -7 | -23 | -151 | -161 | -877 | -1,057 | -3,473 | -6,139 | -20,171 | -24,311 | -132,427 | -141,197 | -926,989 | -3,045,821 | -21,320,747 |
Here are some more numbers to try:
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