A:
Positive:
1 x 217179255 x 434358517 x 127752525 x 86871785 x 255505137 x 158525373 x 58225425 x 51101685 x 317051865 x 116452329 x 93253425 x 6341
Negative:
-1 x -21717925-5 x -4343585-17 x -1277525-25 x -868717-85 x -255505-137 x -158525-373 x -58225-425 x -51101-685 x -31705-1865 x -11645-2329 x -9325-3425 x -6341
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 21,717,925, 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 | 21,717,925 | |
| -1 | -21,717,925 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,717,925.
Example:
1 x 21,717,925 = 21,717,925
and
-1 x -21,717,925 = 21,717,925
Notice both answers equal 21,717,925
With that explanation out of the way, let's continue. Next, we take the number 21,717,925 and divide it by 2:
21,717,925 ÷ 2 = 10,858,962.5
If the quotient is a whole number, then 2 and 10,858,962.5 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 | 21,717,925 | |
| -1 | -21,717,925 |
Now, we try dividing 21,717,925 by 3:
21,717,925 ÷ 3 = 7,239,308.3333
If the quotient is a whole number, then 3 and 7,239,308.3333 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 | 21,717,925 | |
| -1 | -21,717,925 |
Let's try dividing by 4:
21,717,925 ÷ 4 = 5,429,481.25
If the quotient is a whole number, then 4 and 5,429,481.25 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 | 21,717,925 | |
| -1 | 21,717,925 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 25 | 85 | 137 | 373 | 425 | 685 | 1,865 | 2,329 | 3,425 | 6,341 | 9,325 | 11,645 | 31,705 | 51,101 | 58,225 | 158,525 | 255,505 | 868,717 | 1,277,525 | 4,343,585 | 21,717,925 |
| -1 | -5 | -17 | -25 | -85 | -137 | -373 | -425 | -685 | -1,865 | -2,329 | -3,425 | -6,341 | -9,325 | -11,645 | -31,705 | -51,101 | -58,225 | -158,525 | -255,505 | -868,717 | -1,277,525 | -4,343,585 | -21,717,925 |
Here are some more numbers to try:
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