A:
Positive:
1 x 203421255 x 406842525 x 813685109 x 186625125 x 162737545 x 373251493 x 136252725 x 7465
Negative:
-1 x -20342125-5 x -4068425-25 x -813685-109 x -186625-125 x -162737-545 x -37325-1493 x -13625-2725 x -7465
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 20,342,125, 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 | 20,342,125 | |
| -1 | -20,342,125 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,342,125.
Example:
1 x 20,342,125 = 20,342,125
and
-1 x -20,342,125 = 20,342,125
Notice both answers equal 20,342,125
With that explanation out of the way, let's continue. Next, we take the number 20,342,125 and divide it by 2:
20,342,125 ÷ 2 = 10,171,062.5
If the quotient is a whole number, then 2 and 10,171,062.5 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 | 20,342,125 | |
| -1 | -20,342,125 |
Now, we try dividing 20,342,125 by 3:
20,342,125 ÷ 3 = 6,780,708.3333
If the quotient is a whole number, then 3 and 6,780,708.3333 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 | 20,342,125 | |
| -1 | -20,342,125 |
Let's try dividing by 4:
20,342,125 ÷ 4 = 5,085,531.25
If the quotient is a whole number, then 4 and 5,085,531.25 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 | 20,342,125 | |
| -1 | 20,342,125 |
If you did it right, you will end up with this table:
| 1 | 5 | 25 | 109 | 125 | 545 | 1,493 | 2,725 | 7,465 | 13,625 | 37,325 | 162,737 | 186,625 | 813,685 | 4,068,425 | 20,342,125 |
| -1 | -5 | -25 | -109 | -125 | -545 | -1,493 | -2,725 | -7,465 | -13,625 | -37,325 | -162,737 | -186,625 | -813,685 | -4,068,425 | -20,342,125 |
Here are some more numbers to try:
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