A:
Positive:
1 x 208090197 x 297271711 x 189172953 x 39262377 x 270247371 x 56089583 x 356934081 x 5099
Negative:
-1 x -20809019-7 x -2972717-11 x -1891729-53 x -392623-77 x -270247-371 x -56089-583 x -35693-4081 x -5099
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 20,809,019, 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 | 20,809,019 | |
| -1 | -20,809,019 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,809,019.
Example:
1 x 20,809,019 = 20,809,019
and
-1 x -20,809,019 = 20,809,019
Notice both answers equal 20,809,019
With that explanation out of the way, let's continue. Next, we take the number 20,809,019 and divide it by 2:
20,809,019 ÷ 2 = 10,404,509.5
If the quotient is a whole number, then 2 and 10,404,509.5 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 | 20,809,019 | |
| -1 | -20,809,019 |
Now, we try dividing 20,809,019 by 3:
20,809,019 ÷ 3 = 6,936,339.6667
If the quotient is a whole number, then 3 and 6,936,339.6667 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 | 20,809,019 | |
| -1 | -20,809,019 |
Let's try dividing by 4:
20,809,019 ÷ 4 = 5,202,254.75
If the quotient is a whole number, then 4 and 5,202,254.75 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 | 20,809,019 | |
| -1 | 20,809,019 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 53 | 77 | 371 | 583 | 4,081 | 5,099 | 35,693 | 56,089 | 270,247 | 392,623 | 1,891,729 | 2,972,717 | 20,809,019 |
| -1 | -7 | -11 | -53 | -77 | -371 | -583 | -4,081 | -5,099 | -35,693 | -56,089 | -270,247 | -392,623 | -1,891,729 | -2,972,717 | -20,809,019 |
Here are some more numbers to try:
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