A:
Positive:
1 x 188665155 x 377330317 x 110979585 x 221959173 x 109055865 x 218111283 x 147052941 x 6415
Negative:
-1 x -18866515-5 x -3773303-17 x -1109795-85 x -221959-173 x -109055-865 x -21811-1283 x -14705-2941 x -6415
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 18,866,515, 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 | 18,866,515 | |
| -1 | -18,866,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,866,515.
Example:
1 x 18,866,515 = 18,866,515
and
-1 x -18,866,515 = 18,866,515
Notice both answers equal 18,866,515
With that explanation out of the way, let's continue. Next, we take the number 18,866,515 and divide it by 2:
18,866,515 ÷ 2 = 9,433,257.5
If the quotient is a whole number, then 2 and 9,433,257.5 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 | 18,866,515 | |
| -1 | -18,866,515 |
Now, we try dividing 18,866,515 by 3:
18,866,515 ÷ 3 = 6,288,838.3333
If the quotient is a whole number, then 3 and 6,288,838.3333 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 | 18,866,515 | |
| -1 | -18,866,515 |
Let's try dividing by 4:
18,866,515 ÷ 4 = 4,716,628.75
If the quotient is a whole number, then 4 and 4,716,628.75 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 | 18,866,515 | |
| -1 | 18,866,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 173 | 865 | 1,283 | 2,941 | 6,415 | 14,705 | 21,811 | 109,055 | 221,959 | 1,109,795 | 3,773,303 | 18,866,515 |
| -1 | -5 | -17 | -85 | -173 | -865 | -1,283 | -2,941 | -6,415 | -14,705 | -21,811 | -109,055 | -221,959 | -1,109,795 | -3,773,303 | -18,866,515 |
Here are some more numbers to try:
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