A:
Positive:
1 x 203152555 x 406305117 x 119501585 x 239003289 x 70295827 x 245651445 x 140594135 x 4913
Negative:
-1 x -20315255-5 x -4063051-17 x -1195015-85 x -239003-289 x -70295-827 x -24565-1445 x -14059-4135 x -4913
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 20,315,255, 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 | 20,315,255 | |
| -1 | -20,315,255 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,315,255.
Example:
1 x 20,315,255 = 20,315,255
and
-1 x -20,315,255 = 20,315,255
Notice both answers equal 20,315,255
With that explanation out of the way, let's continue. Next, we take the number 20,315,255 and divide it by 2:
20,315,255 ÷ 2 = 10,157,627.5
If the quotient is a whole number, then 2 and 10,157,627.5 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 | 20,315,255 | |
| -1 | -20,315,255 |
Now, we try dividing 20,315,255 by 3:
20,315,255 ÷ 3 = 6,771,751.6667
If the quotient is a whole number, then 3 and 6,771,751.6667 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 | 20,315,255 | |
| -1 | -20,315,255 |
Let's try dividing by 4:
20,315,255 ÷ 4 = 5,078,813.75
If the quotient is a whole number, then 4 and 5,078,813.75 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 | 20,315,255 | |
| -1 | 20,315,255 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 289 | 827 | 1,445 | 4,135 | 4,913 | 14,059 | 24,565 | 70,295 | 239,003 | 1,195,015 | 4,063,051 | 20,315,255 |
| -1 | -5 | -17 | -85 | -289 | -827 | -1,445 | -4,135 | -4,913 | -14,059 | -24,565 | -70,295 | -239,003 | -1,195,015 | -4,063,051 | -20,315,255 |
Here are some more numbers to try:
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