A:
Positive:
1 x 1922191711 x 174744713 x 147860917 x 1130701143 x 134419187 x 102791221 x 869772431 x 7907
Negative:
-1 x -19221917-11 x -1747447-13 x -1478609-17 x -1130701-143 x -134419-187 x -102791-221 x -86977-2431 x -7907
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 19,221,917, 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 | 19,221,917 | |
| -1 | -19,221,917 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 19,221,917.
Example:
1 x 19,221,917 = 19,221,917
and
-1 x -19,221,917 = 19,221,917
Notice both answers equal 19,221,917
With that explanation out of the way, let's continue. Next, we take the number 19,221,917 and divide it by 2:
19,221,917 ÷ 2 = 9,610,958.5
If the quotient is a whole number, then 2 and 9,610,958.5 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 | 19,221,917 | |
| -1 | -19,221,917 |
Now, we try dividing 19,221,917 by 3:
19,221,917 ÷ 3 = 6,407,305.6667
If the quotient is a whole number, then 3 and 6,407,305.6667 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 | 19,221,917 | |
| -1 | -19,221,917 |
Let's try dividing by 4:
19,221,917 ÷ 4 = 4,805,479.25
If the quotient is a whole number, then 4 and 4,805,479.25 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 | 19,221,917 | |
| -1 | 19,221,917 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 17 | 143 | 187 | 221 | 2,431 | 7,907 | 86,977 | 102,791 | 134,419 | 1,130,701 | 1,478,609 | 1,747,447 | 19,221,917 |
| -1 | -11 | -13 | -17 | -143 | -187 | -221 | -2,431 | -7,907 | -86,977 | -102,791 | -134,419 | -1,130,701 | -1,478,609 | -1,747,447 | -19,221,917 |
Here are some more numbers to try:
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