A:
Positive:
1 x 387200177 x 553143123 x 168347929 x 1335173161 x 240497203 x 190739667 x 580514669 x 8293
Negative:
-1 x -38720017-7 x -5531431-23 x -1683479-29 x -1335173-161 x -240497-203 x -190739-667 x -58051-4669 x -8293
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 38,720,017, 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 | 38,720,017 | |
| -1 | -38,720,017 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 38,720,017.
Example:
1 x 38,720,017 = 38,720,017
and
-1 x -38,720,017 = 38,720,017
Notice both answers equal 38,720,017
With that explanation out of the way, let's continue. Next, we take the number 38,720,017 and divide it by 2:
38,720,017 ÷ 2 = 19,360,008.5
If the quotient is a whole number, then 2 and 19,360,008.5 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 | 38,720,017 | |
| -1 | -38,720,017 |
Now, we try dividing 38,720,017 by 3:
38,720,017 ÷ 3 = 12,906,672.3333
If the quotient is a whole number, then 3 and 12,906,672.3333 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 | 38,720,017 | |
| -1 | -38,720,017 |
Let's try dividing by 4:
38,720,017 ÷ 4 = 9,680,004.25
If the quotient is a whole number, then 4 and 9,680,004.25 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 | 38,720,017 | |
| -1 | 38,720,017 |
If you did it right, you will end up with this table:
| 1 | 7 | 23 | 29 | 161 | 203 | 667 | 4,669 | 8,293 | 58,051 | 190,739 | 240,497 | 1,335,173 | 1,683,479 | 5,531,431 | 38,720,017 |
| -1 | -7 | -23 | -29 | -161 | -203 | -667 | -4,669 | -8,293 | -58,051 | -190,739 | -240,497 | -1,335,173 | -1,683,479 | -5,531,431 | -38,720,017 |
Here are some more numbers to try:
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