A:
Positive:
1 x 312207917 x 446011329 x 107657949 x 637159127 x 245833173 x 180467203 x 153797889 x 351191211 x 257811421 x 219713683 x 84775017 x 6223
Negative:
-1 x -31220791-7 x -4460113-29 x -1076579-49 x -637159-127 x -245833-173 x -180467-203 x -153797-889 x -35119-1211 x -25781-1421 x -21971-3683 x -8477-5017 x -6223
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 31,220,791, 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 | 31,220,791 | |
| -1 | -31,220,791 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 31,220,791.
Example:
1 x 31,220,791 = 31,220,791
and
-1 x -31,220,791 = 31,220,791
Notice both answers equal 31,220,791
With that explanation out of the way, let's continue. Next, we take the number 31,220,791 and divide it by 2:
31,220,791 ÷ 2 = 15,610,395.5
If the quotient is a whole number, then 2 and 15,610,395.5 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 | 31,220,791 | |
| -1 | -31,220,791 |
Now, we try dividing 31,220,791 by 3:
31,220,791 ÷ 3 = 10,406,930.3333
If the quotient is a whole number, then 3 and 10,406,930.3333 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 | 31,220,791 | |
| -1 | -31,220,791 |
Let's try dividing by 4:
31,220,791 ÷ 4 = 7,805,197.75
If the quotient is a whole number, then 4 and 7,805,197.75 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 | 31,220,791 | |
| -1 | 31,220,791 |
If you did it right, you will end up with this table:
| 1 | 7 | 29 | 49 | 127 | 173 | 203 | 889 | 1,211 | 1,421 | 3,683 | 5,017 | 6,223 | 8,477 | 21,971 | 25,781 | 35,119 | 153,797 | 180,467 | 245,833 | 637,159 | 1,076,579 | 4,460,113 | 31,220,791 |
| -1 | -7 | -29 | -49 | -127 | -173 | -203 | -889 | -1,211 | -1,421 | -3,683 | -5,017 | -6,223 | -8,477 | -21,971 | -25,781 | -35,119 | -153,797 | -180,467 | -245,833 | -637,159 | -1,076,579 | -4,460,113 | -31,220,791 |
Here are some more numbers to try:
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