A:
Positive:
1 x 218386917 x 311981341 x 53265147 x 464653287 x 76093329 x 663791619 x 134891927 x 11333
Negative:
-1 x -21838691-7 x -3119813-41 x -532651-47 x -464653-287 x -76093-329 x -66379-1619 x -13489-1927 x -11333
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 21,838,691, 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 | 21,838,691 | |
| -1 | -21,838,691 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,838,691.
Example:
1 x 21,838,691 = 21,838,691
and
-1 x -21,838,691 = 21,838,691
Notice both answers equal 21,838,691
With that explanation out of the way, let's continue. Next, we take the number 21,838,691 and divide it by 2:
21,838,691 ÷ 2 = 10,919,345.5
If the quotient is a whole number, then 2 and 10,919,345.5 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 | 21,838,691 | |
| -1 | -21,838,691 |
Now, we try dividing 21,838,691 by 3:
21,838,691 ÷ 3 = 7,279,563.6667
If the quotient is a whole number, then 3 and 7,279,563.6667 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 | 21,838,691 | |
| -1 | -21,838,691 |
Let's try dividing by 4:
21,838,691 ÷ 4 = 5,459,672.75
If the quotient is a whole number, then 4 and 5,459,672.75 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 | 21,838,691 | |
| -1 | 21,838,691 |
If you did it right, you will end up with this table:
| 1 | 7 | 41 | 47 | 287 | 329 | 1,619 | 1,927 | 11,333 | 13,489 | 66,379 | 76,093 | 464,653 | 532,651 | 3,119,813 | 21,838,691 |
| -1 | -7 | -41 | -47 | -287 | -329 | -1,619 | -1,927 | -11,333 | -13,489 | -66,379 | -76,093 | -464,653 | -532,651 | -3,119,813 | -21,838,691 |
Here are some more numbers to try:
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