A:
Positive:
1 x 2091001319 x 110052723 x 90913159 x 354407437 x 47849811 x 257831121 x 186531357 x 15409
Negative:
-1 x -20910013-19 x -1100527-23 x -909131-59 x -354407-437 x -47849-811 x -25783-1121 x -18653-1357 x -15409
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 20,910,013, 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 | 20,910,013 | |
| -1 | -20,910,013 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,910,013.
Example:
1 x 20,910,013 = 20,910,013
and
-1 x -20,910,013 = 20,910,013
Notice both answers equal 20,910,013
With that explanation out of the way, let's continue. Next, we take the number 20,910,013 and divide it by 2:
20,910,013 ÷ 2 = 10,455,006.5
If the quotient is a whole number, then 2 and 10,455,006.5 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 | 20,910,013 | |
| -1 | -20,910,013 |
Now, we try dividing 20,910,013 by 3:
20,910,013 ÷ 3 = 6,970,004.3333
If the quotient is a whole number, then 3 and 6,970,004.3333 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 | 20,910,013 | |
| -1 | -20,910,013 |
Let's try dividing by 4:
20,910,013 ÷ 4 = 5,227,503.25
If the quotient is a whole number, then 4 and 5,227,503.25 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 | 20,910,013 | |
| -1 | 20,910,013 |
If you did it right, you will end up with this table:
| 1 | 19 | 23 | 59 | 437 | 811 | 1,121 | 1,357 | 15,409 | 18,653 | 25,783 | 47,849 | 354,407 | 909,131 | 1,100,527 | 20,910,013 |
| -1 | -19 | -23 | -59 | -437 | -811 | -1,121 | -1,357 | -15,409 | -18,653 | -25,783 | -47,849 | -354,407 | -909,131 | -1,100,527 | -20,910,013 |
Here are some more numbers to try:
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