A:
Positive:
1 x 182359877 x 260514111 x 165781723 x 79286949 x 37216377 x 236831161 x 113267253 x 72079539 x 338331127 x 161811471 x 123971771 x 10297
Negative:
-1 x -18235987-7 x -2605141-11 x -1657817-23 x -792869-49 x -372163-77 x -236831-161 x -113267-253 x -72079-539 x -33833-1127 x -16181-1471 x -12397-1771 x -10297
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 18,235,987, 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 | 18,235,987 | |
| -1 | -18,235,987 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,235,987.
Example:
1 x 18,235,987 = 18,235,987
and
-1 x -18,235,987 = 18,235,987
Notice both answers equal 18,235,987
With that explanation out of the way, let's continue. Next, we take the number 18,235,987 and divide it by 2:
18,235,987 ÷ 2 = 9,117,993.5
If the quotient is a whole number, then 2 and 9,117,993.5 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 | 18,235,987 | |
| -1 | -18,235,987 |
Now, we try dividing 18,235,987 by 3:
18,235,987 ÷ 3 = 6,078,662.3333
If the quotient is a whole number, then 3 and 6,078,662.3333 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 | 18,235,987 | |
| -1 | -18,235,987 |
Let's try dividing by 4:
18,235,987 ÷ 4 = 4,558,996.75
If the quotient is a whole number, then 4 and 4,558,996.75 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 | 18,235,987 | |
| -1 | 18,235,987 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 23 | 49 | 77 | 161 | 253 | 539 | 1,127 | 1,471 | 1,771 | 10,297 | 12,397 | 16,181 | 33,833 | 72,079 | 113,267 | 236,831 | 372,163 | 792,869 | 1,657,817 | 2,605,141 | 18,235,987 |
| -1 | -7 | -11 | -23 | -49 | -77 | -161 | -253 | -539 | -1,127 | -1,471 | -1,771 | -10,297 | -12,397 | -16,181 | -33,833 | -72,079 | -113,267 | -236,831 | -372,163 | -792,869 | -1,657,817 | -2,605,141 | -18,235,987 |
Here are some more numbers to try:
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