A:
Positive:
1 x 217888555 x 435777111 x 198080555 x 396161421 x 51755941 x 231552105 x 103514631 x 4705
Negative:
-1 x -21788855-5 x -4357771-11 x -1980805-55 x -396161-421 x -51755-941 x -23155-2105 x -10351-4631 x -4705
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 21,788,855, 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 | 21,788,855 | |
| -1 | -21,788,855 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,788,855.
Example:
1 x 21,788,855 = 21,788,855
and
-1 x -21,788,855 = 21,788,855
Notice both answers equal 21,788,855
With that explanation out of the way, let's continue. Next, we take the number 21,788,855 and divide it by 2:
21,788,855 ÷ 2 = 10,894,427.5
If the quotient is a whole number, then 2 and 10,894,427.5 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 | 21,788,855 | |
| -1 | -21,788,855 |
Now, we try dividing 21,788,855 by 3:
21,788,855 ÷ 3 = 7,262,951.6667
If the quotient is a whole number, then 3 and 7,262,951.6667 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 | 21,788,855 | |
| -1 | -21,788,855 |
Let's try dividing by 4:
21,788,855 ÷ 4 = 5,447,213.75
If the quotient is a whole number, then 4 and 5,447,213.75 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 | 21,788,855 | |
| -1 | 21,788,855 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 421 | 941 | 2,105 | 4,631 | 4,705 | 10,351 | 23,155 | 51,755 | 396,161 | 1,980,805 | 4,357,771 | 21,788,855 |
| -1 | -5 | -11 | -55 | -421 | -941 | -2,105 | -4,631 | -4,705 | -10,351 | -23,155 | -51,755 | -396,161 | -1,980,805 | -4,357,771 | -21,788,855 |
Here are some more numbers to try:
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