A:
Positive:
1 x 204124155 x 408248331 x 65846579 x 258385155 x 131693395 x 516771667 x 122452449 x 8335
Negative:
-1 x -20412415-5 x -4082483-31 x -658465-79 x -258385-155 x -131693-395 x -51677-1667 x -12245-2449 x -8335
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 20,412,415, 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 | 20,412,415 | |
| -1 | -20,412,415 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,412,415.
Example:
1 x 20,412,415 = 20,412,415
and
-1 x -20,412,415 = 20,412,415
Notice both answers equal 20,412,415
With that explanation out of the way, let's continue. Next, we take the number 20,412,415 and divide it by 2:
20,412,415 ÷ 2 = 10,206,207.5
If the quotient is a whole number, then 2 and 10,206,207.5 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 | 20,412,415 | |
| -1 | -20,412,415 |
Now, we try dividing 20,412,415 by 3:
20,412,415 ÷ 3 = 6,804,138.3333
If the quotient is a whole number, then 3 and 6,804,138.3333 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 | 20,412,415 | |
| -1 | -20,412,415 |
Let's try dividing by 4:
20,412,415 ÷ 4 = 5,103,103.75
If the quotient is a whole number, then 4 and 5,103,103.75 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 | 20,412,415 | |
| -1 | 20,412,415 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 79 | 155 | 395 | 1,667 | 2,449 | 8,335 | 12,245 | 51,677 | 131,693 | 258,385 | 658,465 | 4,082,483 | 20,412,415 |
| -1 | -5 | -31 | -79 | -155 | -395 | -1,667 | -2,449 | -8,335 | -12,245 | -51,677 | -131,693 | -258,385 | -658,465 | -4,082,483 | -20,412,415 |
Here are some more numbers to try:
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