A:
Positive:
1 x 2065136655 x 4130273323 x 8978855115 x 1795771163 x 1266955479 x 431135529 x 390385815 x 2533912395 x 862272645 x 780773749 x 5508511017 x 18745
Negative:
-1 x -206513665-5 x -41302733-23 x -8978855-115 x -1795771-163 x -1266955-479 x -431135-529 x -390385-815 x -253391-2395 x -86227-2645 x -78077-3749 x -55085-11017 x -18745
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 206,513,665, 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 | 206,513,665 | |
| -1 | -206,513,665 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 206,513,665.
Example:
1 x 206,513,665 = 206,513,665
and
-1 x -206,513,665 = 206,513,665
Notice both answers equal 206,513,665
With that explanation out of the way, let's continue. Next, we take the number 206,513,665 and divide it by 2:
206,513,665 ÷ 2 = 103,256,832.5
If the quotient is a whole number, then 2 and 103,256,832.5 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 | 206,513,665 | |
| -1 | -206,513,665 |
Now, we try dividing 206,513,665 by 3:
206,513,665 ÷ 3 = 68,837,888.3333
If the quotient is a whole number, then 3 and 68,837,888.3333 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 | 206,513,665 | |
| -1 | -206,513,665 |
Let's try dividing by 4:
206,513,665 ÷ 4 = 51,628,416.25
If the quotient is a whole number, then 4 and 51,628,416.25 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 | 206,513,665 | |
| -1 | 206,513,665 |
If you did it right, you will end up with this table:
| 1 | 5 | 23 | 115 | 163 | 479 | 529 | 815 | 2,395 | 2,645 | 3,749 | 11,017 | 18,745 | 55,085 | 78,077 | 86,227 | 253,391 | 390,385 | 431,135 | 1,266,955 | 1,795,771 | 8,978,855 | 41,302,733 | 206,513,665 |
| -1 | -5 | -23 | -115 | -163 | -479 | -529 | -815 | -2,395 | -2,645 | -3,749 | -11,017 | -18,745 | -55,085 | -78,077 | -86,227 | -253,391 | -390,385 | -431,135 | -1,266,955 | -1,795,771 | -8,978,855 | -41,302,733 | -206,513,665 |
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