A:
Positive:
1 x 187202055 x 37440417 x 267431535 x 53486349 x 382045109 x 171745245 x 76409545 x 34349701 x 26705763 x 245353505 x 53413815 x 4907
Negative:
-1 x -18720205-5 x -3744041-7 x -2674315-35 x -534863-49 x -382045-109 x -171745-245 x -76409-545 x -34349-701 x -26705-763 x -24535-3505 x -5341-3815 x -4907
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 18,720,205, 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 | 18,720,205 | |
| -1 | -18,720,205 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,720,205.
Example:
1 x 18,720,205 = 18,720,205
and
-1 x -18,720,205 = 18,720,205
Notice both answers equal 18,720,205
With that explanation out of the way, let's continue. Next, we take the number 18,720,205 and divide it by 2:
18,720,205 ÷ 2 = 9,360,102.5
If the quotient is a whole number, then 2 and 9,360,102.5 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 | 18,720,205 | |
| -1 | -18,720,205 |
Now, we try dividing 18,720,205 by 3:
18,720,205 ÷ 3 = 6,240,068.3333
If the quotient is a whole number, then 3 and 6,240,068.3333 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 | 18,720,205 | |
| -1 | -18,720,205 |
Let's try dividing by 4:
18,720,205 ÷ 4 = 4,680,051.25
If the quotient is a whole number, then 4 and 4,680,051.25 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 | 18,720,205 | |
| -1 | 18,720,205 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 109 | 245 | 545 | 701 | 763 | 3,505 | 3,815 | 4,907 | 5,341 | 24,535 | 26,705 | 34,349 | 76,409 | 171,745 | 382,045 | 534,863 | 2,674,315 | 3,744,041 | 18,720,205 |
| -1 | -5 | -7 | -35 | -49 | -109 | -245 | -545 | -701 | -763 | -3,505 | -3,815 | -4,907 | -5,341 | -24,535 | -26,705 | -34,349 | -76,409 | -171,745 | -382,045 | -534,863 | -2,674,315 | -3,744,041 | -18,720,205 |
Here are some more numbers to try:
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