A:
Positive:
1 x 215168455 x 43033697 x 307383523 x 93551535 x 614767115 x 187103161 x 133645805 x 26729
Negative:
-1 x -21516845-5 x -4303369-7 x -3073835-23 x -935515-35 x -614767-115 x -187103-161 x -133645-805 x -26729
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 21,516,845, 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 | 21,516,845 | |
| -1 | -21,516,845 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,516,845.
Example:
1 x 21,516,845 = 21,516,845
and
-1 x -21,516,845 = 21,516,845
Notice both answers equal 21,516,845
With that explanation out of the way, let's continue. Next, we take the number 21,516,845 and divide it by 2:
21,516,845 ÷ 2 = 10,758,422.5
If the quotient is a whole number, then 2 and 10,758,422.5 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 | 21,516,845 | |
| -1 | -21,516,845 |
Now, we try dividing 21,516,845 by 3:
21,516,845 ÷ 3 = 7,172,281.6667
If the quotient is a whole number, then 3 and 7,172,281.6667 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 | 21,516,845 | |
| -1 | -21,516,845 |
Let's try dividing by 4:
21,516,845 ÷ 4 = 5,379,211.25
If the quotient is a whole number, then 4 and 5,379,211.25 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 | 21,516,845 | |
| -1 | 21,516,845 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 23 | 35 | 115 | 161 | 805 | 26,729 | 133,645 | 187,103 | 614,767 | 935,515 | 3,073,835 | 4,303,369 | 21,516,845 |
| -1 | -5 | -7 | -23 | -35 | -115 | -161 | -805 | -26,729 | -133,645 | -187,103 | -614,767 | -935,515 | -3,073,835 | -4,303,369 | -21,516,845 |
Here are some more numbers to try:
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