A:
Positive:
1 x 207818597 x 296883767 x 31017773 x 284683469 x 44311511 x 40669607 x 342374249 x 4891
Negative:
-1 x -20781859-7 x -2968837-67 x -310177-73 x -284683-469 x -44311-511 x -40669-607 x -34237-4249 x -4891
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 20,781,859, 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 | 20,781,859 | |
| -1 | -20,781,859 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,781,859.
Example:
1 x 20,781,859 = 20,781,859
and
-1 x -20,781,859 = 20,781,859
Notice both answers equal 20,781,859
With that explanation out of the way, let's continue. Next, we take the number 20,781,859 and divide it by 2:
20,781,859 ÷ 2 = 10,390,929.5
If the quotient is a whole number, then 2 and 10,390,929.5 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 | 20,781,859 | |
| -1 | -20,781,859 |
Now, we try dividing 20,781,859 by 3:
20,781,859 ÷ 3 = 6,927,286.3333
If the quotient is a whole number, then 3 and 6,927,286.3333 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 | 20,781,859 | |
| -1 | -20,781,859 |
Let's try dividing by 4:
20,781,859 ÷ 4 = 5,195,464.75
If the quotient is a whole number, then 4 and 5,195,464.75 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 | 20,781,859 | |
| -1 | 20,781,859 |
If you did it right, you will end up with this table:
| 1 | 7 | 67 | 73 | 469 | 511 | 607 | 4,249 | 4,891 | 34,237 | 40,669 | 44,311 | 284,683 | 310,177 | 2,968,837 | 20,781,859 |
| -1 | -7 | -67 | -73 | -469 | -511 | -607 | -4,249 | -4,891 | -34,237 | -40,669 | -44,311 | -284,683 | -310,177 | -2,968,837 | -20,781,859 |
Here are some more numbers to try:
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