A:
Positive:
1 x 2081584919 x 109557131 x 67147959 x 352811589 x 35341599 x 347511121 x 185691829 x 11381
Negative:
-1 x -20815849-19 x -1095571-31 x -671479-59 x -352811-589 x -35341-599 x -34751-1121 x -18569-1829 x -11381
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 20,815,849, 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 | 20,815,849 | |
| -1 | -20,815,849 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,815,849.
Example:
1 x 20,815,849 = 20,815,849
and
-1 x -20,815,849 = 20,815,849
Notice both answers equal 20,815,849
With that explanation out of the way, let's continue. Next, we take the number 20,815,849 and divide it by 2:
20,815,849 ÷ 2 = 10,407,924.5
If the quotient is a whole number, then 2 and 10,407,924.5 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 | 20,815,849 | |
| -1 | -20,815,849 |
Now, we try dividing 20,815,849 by 3:
20,815,849 ÷ 3 = 6,938,616.3333
If the quotient is a whole number, then 3 and 6,938,616.3333 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 | 20,815,849 | |
| -1 | -20,815,849 |
Let's try dividing by 4:
20,815,849 ÷ 4 = 5,203,962.25
If the quotient is a whole number, then 4 and 5,203,962.25 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 | 20,815,849 | |
| -1 | 20,815,849 |
If you did it right, you will end up with this table:
| 1 | 19 | 31 | 59 | 589 | 599 | 1,121 | 1,829 | 11,381 | 18,569 | 34,751 | 35,341 | 352,811 | 671,479 | 1,095,571 | 20,815,849 |
| -1 | -19 | -31 | -59 | -589 | -599 | -1,121 | -1,829 | -11,381 | -18,569 | -34,751 | -35,341 | -352,811 | -671,479 | -1,095,571 | -20,815,849 |
Here are some more numbers to try:
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