A:
Positive:
1 x 1889719119 x 99458923 x 82161783 x 227677437 x 43243521 x 362711577 x 119831909 x 9899
Negative:
-1 x -18897191-19 x -994589-23 x -821617-83 x -227677-437 x -43243-521 x -36271-1577 x -11983-1909 x -9899
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 18,897,191, 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 | 18,897,191 | |
| -1 | -18,897,191 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,897,191.
Example:
1 x 18,897,191 = 18,897,191
and
-1 x -18,897,191 = 18,897,191
Notice both answers equal 18,897,191
With that explanation out of the way, let's continue. Next, we take the number 18,897,191 and divide it by 2:
18,897,191 ÷ 2 = 9,448,595.5
If the quotient is a whole number, then 2 and 9,448,595.5 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 | 18,897,191 | |
| -1 | -18,897,191 |
Now, we try dividing 18,897,191 by 3:
18,897,191 ÷ 3 = 6,299,063.6667
If the quotient is a whole number, then 3 and 6,299,063.6667 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 | 18,897,191 | |
| -1 | -18,897,191 |
Let's try dividing by 4:
18,897,191 ÷ 4 = 4,724,297.75
If the quotient is a whole number, then 4 and 4,724,297.75 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 | 18,897,191 | |
| -1 | 18,897,191 |
If you did it right, you will end up with this table:
| 1 | 19 | 23 | 83 | 437 | 521 | 1,577 | 1,909 | 9,899 | 11,983 | 36,271 | 43,243 | 227,677 | 821,617 | 994,589 | 18,897,191 |
| -1 | -19 | -23 | -83 | -437 | -521 | -1,577 | -1,909 | -9,899 | -11,983 | -36,271 | -43,243 | -227,677 | -821,617 | -994,589 | -18,897,191 |
Here are some more numbers to try:
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