A:
Positive:
1 x 201230155 x 402460311 x 182936555 x 365873151 x 133265755 x 266531661 x 121152423 x 8305
Negative:
-1 x -20123015-5 x -4024603-11 x -1829365-55 x -365873-151 x -133265-755 x -26653-1661 x -12115-2423 x -8305
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 20,123,015, 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 | 20,123,015 | |
| -1 | -20,123,015 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,123,015.
Example:
1 x 20,123,015 = 20,123,015
and
-1 x -20,123,015 = 20,123,015
Notice both answers equal 20,123,015
With that explanation out of the way, let's continue. Next, we take the number 20,123,015 and divide it by 2:
20,123,015 ÷ 2 = 10,061,507.5
If the quotient is a whole number, then 2 and 10,061,507.5 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 | 20,123,015 | |
| -1 | -20,123,015 |
Now, we try dividing 20,123,015 by 3:
20,123,015 ÷ 3 = 6,707,671.6667
If the quotient is a whole number, then 3 and 6,707,671.6667 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 | 20,123,015 | |
| -1 | -20,123,015 |
Let's try dividing by 4:
20,123,015 ÷ 4 = 5,030,753.75
If the quotient is a whole number, then 4 and 5,030,753.75 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 | 20,123,015 | |
| -1 | 20,123,015 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 151 | 755 | 1,661 | 2,423 | 8,305 | 12,115 | 26,653 | 133,265 | 365,873 | 1,829,365 | 4,024,603 | 20,123,015 |
| -1 | -5 | -11 | -55 | -151 | -755 | -1,661 | -2,423 | -8,305 | -12,115 | -26,653 | -133,265 | -365,873 | -1,829,365 | -4,024,603 | -20,123,015 |
Here are some more numbers to try:
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