A:
Positive:
1 x 208806655 x 417613313 x 160620523 x 90785565 x 321241115 x 181571299 x 698351495 x 13967
Negative:
-1 x -20880665-5 x -4176133-13 x -1606205-23 x -907855-65 x -321241-115 x -181571-299 x -69835-1495 x -13967
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 20,880,665, 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 | 20,880,665 | |
| -1 | -20,880,665 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,880,665.
Example:
1 x 20,880,665 = 20,880,665
and
-1 x -20,880,665 = 20,880,665
Notice both answers equal 20,880,665
With that explanation out of the way, let's continue. Next, we take the number 20,880,665 and divide it by 2:
20,880,665 ÷ 2 = 10,440,332.5
If the quotient is a whole number, then 2 and 10,440,332.5 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 | 20,880,665 | |
| -1 | -20,880,665 |
Now, we try dividing 20,880,665 by 3:
20,880,665 ÷ 3 = 6,960,221.6667
If the quotient is a whole number, then 3 and 6,960,221.6667 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 | 20,880,665 | |
| -1 | -20,880,665 |
Let's try dividing by 4:
20,880,665 ÷ 4 = 5,220,166.25
If the quotient is a whole number, then 4 and 5,220,166.25 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 | 20,880,665 | |
| -1 | 20,880,665 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 23 | 65 | 115 | 299 | 1,495 | 13,967 | 69,835 | 181,571 | 321,241 | 907,855 | 1,606,205 | 4,176,133 | 20,880,665 |
| -1 | -5 | -13 | -23 | -65 | -115 | -299 | -1,495 | -13,967 | -69,835 | -181,571 | -321,241 | -907,855 | -1,606,205 | -4,176,133 | -20,880,665 |
Here are some more numbers to try:
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