A:
Positive:
1 x 208084255 x 416168511 x 189167517 x 122402525 x 83233755 x 37833585 x 244805187 x 111275275 x 75667425 x 48961935 x 222554451 x 4675
Negative:
-1 x -20808425-5 x -4161685-11 x -1891675-17 x -1224025-25 x -832337-55 x -378335-85 x -244805-187 x -111275-275 x -75667-425 x -48961-935 x -22255-4451 x -4675
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 20,808,425, 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 | 20,808,425 | |
| -1 | -20,808,425 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,808,425.
Example:
1 x 20,808,425 = 20,808,425
and
-1 x -20,808,425 = 20,808,425
Notice both answers equal 20,808,425
With that explanation out of the way, let's continue. Next, we take the number 20,808,425 and divide it by 2:
20,808,425 ÷ 2 = 10,404,212.5
If the quotient is a whole number, then 2 and 10,404,212.5 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 | 20,808,425 | |
| -1 | -20,808,425 |
Now, we try dividing 20,808,425 by 3:
20,808,425 ÷ 3 = 6,936,141.6667
If the quotient is a whole number, then 3 and 6,936,141.6667 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 | 20,808,425 | |
| -1 | -20,808,425 |
Let's try dividing by 4:
20,808,425 ÷ 4 = 5,202,106.25
If the quotient is a whole number, then 4 and 5,202,106.25 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 | 20,808,425 | |
| -1 | 20,808,425 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 17 | 25 | 55 | 85 | 187 | 275 | 425 | 935 | 4,451 | 4,675 | 22,255 | 48,961 | 75,667 | 111,275 | 244,805 | 378,335 | 832,337 | 1,224,025 | 1,891,675 | 4,161,685 | 20,808,425 |
| -1 | -5 | -11 | -17 | -25 | -55 | -85 | -187 | -275 | -425 | -935 | -4,451 | -4,675 | -22,255 | -48,961 | -75,667 | -111,275 | -244,805 | -378,335 | -832,337 | -1,224,025 | -1,891,675 | -4,161,685 | -20,808,425 |
Here are some more numbers to try:
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