A:
Positive:
1 x 218051355 x 436102711 x 198228517 x 128265555 x 39645785 x 256531187 x 116605935 x 23321
Negative:
-1 x -21805135-5 x -4361027-11 x -1982285-17 x -1282655-55 x -396457-85 x -256531-187 x -116605-935 x -23321
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 21,805,135, 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 | 21,805,135 | |
| -1 | -21,805,135 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,805,135.
Example:
1 x 21,805,135 = 21,805,135
and
-1 x -21,805,135 = 21,805,135
Notice both answers equal 21,805,135
With that explanation out of the way, let's continue. Next, we take the number 21,805,135 and divide it by 2:
21,805,135 ÷ 2 = 10,902,567.5
If the quotient is a whole number, then 2 and 10,902,567.5 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 | 21,805,135 | |
| -1 | -21,805,135 |
Now, we try dividing 21,805,135 by 3:
21,805,135 ÷ 3 = 7,268,378.3333
If the quotient is a whole number, then 3 and 7,268,378.3333 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 | 21,805,135 | |
| -1 | -21,805,135 |
Let's try dividing by 4:
21,805,135 ÷ 4 = 5,451,283.75
If the quotient is a whole number, then 4 and 5,451,283.75 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 | 21,805,135 | |
| -1 | 21,805,135 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 17 | 55 | 85 | 187 | 935 | 23,321 | 116,605 | 256,531 | 396,457 | 1,282,655 | 1,982,285 | 4,361,027 | 21,805,135 |
| -1 | -5 | -11 | -17 | -55 | -85 | -187 | -935 | -23,321 | -116,605 | -256,531 | -396,457 | -1,282,655 | -1,982,285 | -4,361,027 | -21,805,135 |
Here are some more numbers to try:
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