A:
Positive:
1 x 1851991911 x 168362917 x 108940797 x 190927187 x 990371021 x 181391067 x 173571649 x 11231
Negative:
-1 x -18519919-11 x -1683629-17 x -1089407-97 x -190927-187 x -99037-1021 x -18139-1067 x -17357-1649 x -11231
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 18,519,919, 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 | 18,519,919 | |
| -1 | -18,519,919 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,519,919.
Example:
1 x 18,519,919 = 18,519,919
and
-1 x -18,519,919 = 18,519,919
Notice both answers equal 18,519,919
With that explanation out of the way, let's continue. Next, we take the number 18,519,919 and divide it by 2:
18,519,919 ÷ 2 = 9,259,959.5
If the quotient is a whole number, then 2 and 9,259,959.5 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 | 18,519,919 | |
| -1 | -18,519,919 |
Now, we try dividing 18,519,919 by 3:
18,519,919 ÷ 3 = 6,173,306.3333
If the quotient is a whole number, then 3 and 6,173,306.3333 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 | 18,519,919 | |
| -1 | -18,519,919 |
Let's try dividing by 4:
18,519,919 ÷ 4 = 4,629,979.75
If the quotient is a whole number, then 4 and 4,629,979.75 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 | 18,519,919 | |
| -1 | 18,519,919 |
If you did it right, you will end up with this table:
| 1 | 11 | 17 | 97 | 187 | 1,021 | 1,067 | 1,649 | 11,231 | 17,357 | 18,139 | 99,037 | 190,927 | 1,089,407 | 1,683,629 | 18,519,919 |
| -1 | -11 | -17 | -97 | -187 | -1,021 | -1,067 | -1,649 | -11,231 | -17,357 | -18,139 | -99,037 | -190,927 | -1,089,407 | -1,683,629 | -18,519,919 |
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