A:
Positive:
1 x 204157455 x 40831497 x 291653535 x 58330741 x 497945205 x 99589287 x 71135347 x 588351435 x 142271681 x 121451735 x 117672429 x 8405
Negative:
-1 x -20415745-5 x -4083149-7 x -2916535-35 x -583307-41 x -497945-205 x -99589-287 x -71135-347 x -58835-1435 x -14227-1681 x -12145-1735 x -11767-2429 x -8405
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 20,415,745, 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 | 20,415,745 | |
| -1 | -20,415,745 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,415,745.
Example:
1 x 20,415,745 = 20,415,745
and
-1 x -20,415,745 = 20,415,745
Notice both answers equal 20,415,745
With that explanation out of the way, let's continue. Next, we take the number 20,415,745 and divide it by 2:
20,415,745 ÷ 2 = 10,207,872.5
If the quotient is a whole number, then 2 and 10,207,872.5 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 | 20,415,745 | |
| -1 | -20,415,745 |
Now, we try dividing 20,415,745 by 3:
20,415,745 ÷ 3 = 6,805,248.3333
If the quotient is a whole number, then 3 and 6,805,248.3333 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 | 20,415,745 | |
| -1 | -20,415,745 |
Let's try dividing by 4:
20,415,745 ÷ 4 = 5,103,936.25
If the quotient is a whole number, then 4 and 5,103,936.25 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 | 20,415,745 | |
| -1 | 20,415,745 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 41 | 205 | 287 | 347 | 1,435 | 1,681 | 1,735 | 2,429 | 8,405 | 11,767 | 12,145 | 14,227 | 58,835 | 71,135 | 99,589 | 497,945 | 583,307 | 2,916,535 | 4,083,149 | 20,415,745 |
| -1 | -5 | -7 | -35 | -41 | -205 | -287 | -347 | -1,435 | -1,681 | -1,735 | -2,429 | -8,405 | -11,767 | -12,145 | -14,227 | -58,835 | -71,135 | -99,589 | -497,945 | -583,307 | -2,916,535 | -4,083,149 | -20,415,745 |
Here are some more numbers to try:
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