A:
Positive:
1 x 208162577 x 297375111 x 189238743 x 48409977 x 270341301 x 69157473 x 440093311 x 6287
Negative:
-1 x -20816257-7 x -2973751-11 x -1892387-43 x -484099-77 x -270341-301 x -69157-473 x -44009-3311 x -6287
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 20,816,257, 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 | 20,816,257 | |
| -1 | -20,816,257 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,816,257.
Example:
1 x 20,816,257 = 20,816,257
and
-1 x -20,816,257 = 20,816,257
Notice both answers equal 20,816,257
With that explanation out of the way, let's continue. Next, we take the number 20,816,257 and divide it by 2:
20,816,257 ÷ 2 = 10,408,128.5
If the quotient is a whole number, then 2 and 10,408,128.5 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 | 20,816,257 | |
| -1 | -20,816,257 |
Now, we try dividing 20,816,257 by 3:
20,816,257 ÷ 3 = 6,938,752.3333
If the quotient is a whole number, then 3 and 6,938,752.3333 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 | 20,816,257 | |
| -1 | -20,816,257 |
Let's try dividing by 4:
20,816,257 ÷ 4 = 5,204,064.25
If the quotient is a whole number, then 4 and 5,204,064.25 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 | 20,816,257 | |
| -1 | 20,816,257 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 43 | 77 | 301 | 473 | 3,311 | 6,287 | 44,009 | 69,157 | 270,341 | 484,099 | 1,892,387 | 2,973,751 | 20,816,257 |
| -1 | -7 | -11 | -43 | -77 | -301 | -473 | -3,311 | -6,287 | -44,009 | -69,157 | -270,341 | -484,099 | -1,892,387 | -2,973,751 | -20,816,257 |
Here are some more numbers to try:
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