A:
Positive:
1 x 201314055 x 40262817 x 287591535 x 57518349 x 410845127 x 158515245 x 82169635 x 31703647 x 31115889 x 226453235 x 62234445 x 4529
Negative:
-1 x -20131405-5 x -4026281-7 x -2875915-35 x -575183-49 x -410845-127 x -158515-245 x -82169-635 x -31703-647 x -31115-889 x -22645-3235 x -6223-4445 x -4529
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 20,131,405, 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 | 20,131,405 | |
| -1 | -20,131,405 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,131,405.
Example:
1 x 20,131,405 = 20,131,405
and
-1 x -20,131,405 = 20,131,405
Notice both answers equal 20,131,405
With that explanation out of the way, let's continue. Next, we take the number 20,131,405 and divide it by 2:
20,131,405 ÷ 2 = 10,065,702.5
If the quotient is a whole number, then 2 and 10,065,702.5 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 | 20,131,405 | |
| -1 | -20,131,405 |
Now, we try dividing 20,131,405 by 3:
20,131,405 ÷ 3 = 6,710,468.3333
If the quotient is a whole number, then 3 and 6,710,468.3333 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 | 20,131,405 | |
| -1 | -20,131,405 |
Let's try dividing by 4:
20,131,405 ÷ 4 = 5,032,851.25
If the quotient is a whole number, then 4 and 5,032,851.25 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 | 20,131,405 | |
| -1 | 20,131,405 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 127 | 245 | 635 | 647 | 889 | 3,235 | 4,445 | 4,529 | 6,223 | 22,645 | 31,115 | 31,703 | 82,169 | 158,515 | 410,845 | 575,183 | 2,875,915 | 4,026,281 | 20,131,405 |
| -1 | -5 | -7 | -35 | -49 | -127 | -245 | -635 | -647 | -889 | -3,235 | -4,445 | -4,529 | -6,223 | -22,645 | -31,115 | -31,703 | -82,169 | -158,515 | -410,845 | -575,183 | -2,875,915 | -4,026,281 | -20,131,405 |
Here are some more numbers to try:
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