A:
Positive:
1 x 204213355 x 408426711 x 185648517 x 120125555 x 37129785 x 240251187 x 109205935 x 21841
Negative:
-1 x -20421335-5 x -4084267-11 x -1856485-17 x -1201255-55 x -371297-85 x -240251-187 x -109205-935 x -21841
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 20,421,335, 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 | 20,421,335 | |
| -1 | -20,421,335 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,421,335.
Example:
1 x 20,421,335 = 20,421,335
and
-1 x -20,421,335 = 20,421,335
Notice both answers equal 20,421,335
With that explanation out of the way, let's continue. Next, we take the number 20,421,335 and divide it by 2:
20,421,335 ÷ 2 = 10,210,667.5
If the quotient is a whole number, then 2 and 10,210,667.5 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 | 20,421,335 | |
| -1 | -20,421,335 |
Now, we try dividing 20,421,335 by 3:
20,421,335 ÷ 3 = 6,807,111.6667
If the quotient is a whole number, then 3 and 6,807,111.6667 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 | 20,421,335 | |
| -1 | -20,421,335 |
Let's try dividing by 4:
20,421,335 ÷ 4 = 5,105,333.75
If the quotient is a whole number, then 4 and 5,105,333.75 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 | 20,421,335 | |
| -1 | 20,421,335 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 17 | 55 | 85 | 187 | 935 | 21,841 | 109,205 | 240,251 | 371,297 | 1,201,255 | 1,856,485 | 4,084,267 | 20,421,335 |
| -1 | -5 | -11 | -17 | -55 | -85 | -187 | -935 | -21,841 | -109,205 | -240,251 | -371,297 | -1,201,255 | -1,856,485 | -4,084,267 | -20,421,335 |
Here are some more numbers to try:
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