A:
Positive:
1 x 213565855 x 427131737 x 57720567 x 318755185 x 115441335 x 637511723 x 123952479 x 8615
Negative:
-1 x -21356585-5 x -4271317-37 x -577205-67 x -318755-185 x -115441-335 x -63751-1723 x -12395-2479 x -8615
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 21,356,585, 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 | 21,356,585 | |
| -1 | -21,356,585 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,356,585.
Example:
1 x 21,356,585 = 21,356,585
and
-1 x -21,356,585 = 21,356,585
Notice both answers equal 21,356,585
With that explanation out of the way, let's continue. Next, we take the number 21,356,585 and divide it by 2:
21,356,585 ÷ 2 = 10,678,292.5
If the quotient is a whole number, then 2 and 10,678,292.5 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 | 21,356,585 | |
| -1 | -21,356,585 |
Now, we try dividing 21,356,585 by 3:
21,356,585 ÷ 3 = 7,118,861.6667
If the quotient is a whole number, then 3 and 7,118,861.6667 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 | 21,356,585 | |
| -1 | -21,356,585 |
Let's try dividing by 4:
21,356,585 ÷ 4 = 5,339,146.25
If the quotient is a whole number, then 4 and 5,339,146.25 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 | 21,356,585 | |
| -1 | 21,356,585 |
If you did it right, you will end up with this table:
| 1 | 5 | 37 | 67 | 185 | 335 | 1,723 | 2,479 | 8,615 | 12,395 | 63,751 | 115,441 | 318,755 | 577,205 | 4,271,317 | 21,356,585 |
| -1 | -5 | -37 | -67 | -185 | -335 | -1,723 | -2,479 | -8,615 | -12,395 | -63,751 | -115,441 | -318,755 | -577,205 | -4,271,317 | -21,356,585 |
Here are some more numbers to try:
Try the factor calculator