A:
Positive:
1 x 2072464911 x 188405917 x 121909719 x 1090771187 x 110827209 x 99161307 x 67507323 x 64163361 x 574093377 x 61373553 x 58333971 x 5219
Negative:
-1 x -20724649-11 x -1884059-17 x -1219097-19 x -1090771-187 x -110827-209 x -99161-307 x -67507-323 x -64163-361 x -57409-3377 x -6137-3553 x -5833-3971 x -5219
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 20,724,649, 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 | 20,724,649 | |
| -1 | -20,724,649 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,724,649.
Example:
1 x 20,724,649 = 20,724,649
and
-1 x -20,724,649 = 20,724,649
Notice both answers equal 20,724,649
With that explanation out of the way, let's continue. Next, we take the number 20,724,649 and divide it by 2:
20,724,649 ÷ 2 = 10,362,324.5
If the quotient is a whole number, then 2 and 10,362,324.5 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 | 20,724,649 | |
| -1 | -20,724,649 |
Now, we try dividing 20,724,649 by 3:
20,724,649 ÷ 3 = 6,908,216.3333
If the quotient is a whole number, then 3 and 6,908,216.3333 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 | 20,724,649 | |
| -1 | -20,724,649 |
Let's try dividing by 4:
20,724,649 ÷ 4 = 5,181,162.25
If the quotient is a whole number, then 4 and 5,181,162.25 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 | 20,724,649 | |
| -1 | 20,724,649 |
If you did it right, you will end up with this table:
| 1 | 11 | 17 | 19 | 187 | 209 | 307 | 323 | 361 | 3,377 | 3,553 | 3,971 | 5,219 | 5,833 | 6,137 | 57,409 | 64,163 | 67,507 | 99,161 | 110,827 | 1,090,771 | 1,219,097 | 1,884,059 | 20,724,649 |
| -1 | -11 | -17 | -19 | -187 | -209 | -307 | -323 | -361 | -3,377 | -3,553 | -3,971 | -5,219 | -5,833 | -6,137 | -57,409 | -64,163 | -67,507 | -99,161 | -110,827 | -1,090,771 | -1,219,097 | -1,884,059 | -20,724,649 |
Here are some more numbers to try:
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