A:
Positive:
1 x 198082437 x 282974913 x 152371191 x 217673109 x 181727763 x 259611417 x 139791997 x 9919
Negative:
-1 x -19808243-7 x -2829749-13 x -1523711-91 x -217673-109 x -181727-763 x -25961-1417 x -13979-1997 x -9919
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 19,808,243, 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 | 19,808,243 | |
| -1 | -19,808,243 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 19,808,243.
Example:
1 x 19,808,243 = 19,808,243
and
-1 x -19,808,243 = 19,808,243
Notice both answers equal 19,808,243
With that explanation out of the way, let's continue. Next, we take the number 19,808,243 and divide it by 2:
19,808,243 ÷ 2 = 9,904,121.5
If the quotient is a whole number, then 2 and 9,904,121.5 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 | 19,808,243 | |
| -1 | -19,808,243 |
Now, we try dividing 19,808,243 by 3:
19,808,243 ÷ 3 = 6,602,747.6667
If the quotient is a whole number, then 3 and 6,602,747.6667 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 | 19,808,243 | |
| -1 | -19,808,243 |
Let's try dividing by 4:
19,808,243 ÷ 4 = 4,952,060.75
If the quotient is a whole number, then 4 and 4,952,060.75 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 | 19,808,243 | |
| -1 | 19,808,243 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 109 | 763 | 1,417 | 1,997 | 9,919 | 13,979 | 25,961 | 181,727 | 217,673 | 1,523,711 | 2,829,749 | 19,808,243 |
| -1 | -7 | -13 | -91 | -109 | -763 | -1,417 | -1,997 | -9,919 | -13,979 | -25,961 | -181,727 | -217,673 | -1,523,711 | -2,829,749 | -19,808,243 |
Here are some more numbers to try:
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