A:
Positive:
1 x 1772145111 x 161104153 x 334367113 x 156827269 x 65879583 x 303971243 x 142572959 x 5989
Negative:
-1 x -17721451-11 x -1611041-53 x -334367-113 x -156827-269 x -65879-583 x -30397-1243 x -14257-2959 x -5989
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 17,721,451, 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 | 17,721,451 | |
| -1 | -17,721,451 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 17,721,451.
Example:
1 x 17,721,451 = 17,721,451
and
-1 x -17,721,451 = 17,721,451
Notice both answers equal 17,721,451
With that explanation out of the way, let's continue. Next, we take the number 17,721,451 and divide it by 2:
17,721,451 ÷ 2 = 8,860,725.5
If the quotient is a whole number, then 2 and 8,860,725.5 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 | 17,721,451 | |
| -1 | -17,721,451 |
Now, we try dividing 17,721,451 by 3:
17,721,451 ÷ 3 = 5,907,150.3333
If the quotient is a whole number, then 3 and 5,907,150.3333 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 | 17,721,451 | |
| -1 | -17,721,451 |
Let's try dividing by 4:
17,721,451 ÷ 4 = 4,430,362.75
If the quotient is a whole number, then 4 and 4,430,362.75 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 | 17,721,451 | |
| -1 | 17,721,451 |
If you did it right, you will end up with this table:
| 1 | 11 | 53 | 113 | 269 | 583 | 1,243 | 2,959 | 5,989 | 14,257 | 30,397 | 65,879 | 156,827 | 334,367 | 1,611,041 | 17,721,451 |
| -1 | -11 | -53 | -113 | -269 | -583 | -1,243 | -2,959 | -5,989 | -14,257 | -30,397 | -65,879 | -156,827 | -334,367 | -1,611,041 | -17,721,451 |
Here are some more numbers to try:
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