A:
Positive:
1 x 206135155 x 412270313 x 158565565 x 317131307 x 671451033 x 199551535 x 134293991 x 5165
Negative:
-1 x -20613515-5 x -4122703-13 x -1585655-65 x -317131-307 x -67145-1033 x -19955-1535 x -13429-3991 x -5165
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 20,613,515, 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 | 20,613,515 | |
| -1 | -20,613,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,613,515.
Example:
1 x 20,613,515 = 20,613,515
and
-1 x -20,613,515 = 20,613,515
Notice both answers equal 20,613,515
With that explanation out of the way, let's continue. Next, we take the number 20,613,515 and divide it by 2:
20,613,515 ÷ 2 = 10,306,757.5
If the quotient is a whole number, then 2 and 10,306,757.5 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 | 20,613,515 | |
| -1 | -20,613,515 |
Now, we try dividing 20,613,515 by 3:
20,613,515 ÷ 3 = 6,871,171.6667
If the quotient is a whole number, then 3 and 6,871,171.6667 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 | 20,613,515 | |
| -1 | -20,613,515 |
Let's try dividing by 4:
20,613,515 ÷ 4 = 5,153,378.75
If the quotient is a whole number, then 4 and 5,153,378.75 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 | 20,613,515 | |
| -1 | 20,613,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 307 | 1,033 | 1,535 | 3,991 | 5,165 | 13,429 | 19,955 | 67,145 | 317,131 | 1,585,655 | 4,122,703 | 20,613,515 |
| -1 | -5 | -13 | -65 | -307 | -1,033 | -1,535 | -3,991 | -5,165 | -13,429 | -19,955 | -67,145 | -317,131 | -1,585,655 | -4,122,703 | -20,613,515 |
Here are some more numbers to try:
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