A:
Positive:
1 x 209173855 x 418347719 x 110091595 x 220183421 x 49685523 x 399952105 x 99372615 x 7999
Negative:
-1 x -20917385-5 x -4183477-19 x -1100915-95 x -220183-421 x -49685-523 x -39995-2105 x -9937-2615 x -7999
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 20,917,385, 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 | 20,917,385 | |
| -1 | -20,917,385 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,917,385.
Example:
1 x 20,917,385 = 20,917,385
and
-1 x -20,917,385 = 20,917,385
Notice both answers equal 20,917,385
With that explanation out of the way, let's continue. Next, we take the number 20,917,385 and divide it by 2:
20,917,385 ÷ 2 = 10,458,692.5
If the quotient is a whole number, then 2 and 10,458,692.5 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 | 20,917,385 | |
| -1 | -20,917,385 |
Now, we try dividing 20,917,385 by 3:
20,917,385 ÷ 3 = 6,972,461.6667
If the quotient is a whole number, then 3 and 6,972,461.6667 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 | 20,917,385 | |
| -1 | -20,917,385 |
Let's try dividing by 4:
20,917,385 ÷ 4 = 5,229,346.25
If the quotient is a whole number, then 4 and 5,229,346.25 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 | 20,917,385 | |
| -1 | 20,917,385 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 421 | 523 | 2,105 | 2,615 | 7,999 | 9,937 | 39,995 | 49,685 | 220,183 | 1,100,915 | 4,183,477 | 20,917,385 |
| -1 | -5 | -19 | -95 | -421 | -523 | -2,105 | -2,615 | -7,999 | -9,937 | -39,995 | -49,685 | -220,183 | -1,100,915 | -4,183,477 | -20,917,385 |
Here are some more numbers to try:
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