A:
Positive:
1 x 207824655 x 415649311 x 188931555 x 377863379 x 54835997 x 208451895 x 109674169 x 4985
Negative:
-1 x -20782465-5 x -4156493-11 x -1889315-55 x -377863-379 x -54835-997 x -20845-1895 x -10967-4169 x -4985
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 20,782,465, 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 | 20,782,465 | |
| -1 | -20,782,465 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,782,465.
Example:
1 x 20,782,465 = 20,782,465
and
-1 x -20,782,465 = 20,782,465
Notice both answers equal 20,782,465
With that explanation out of the way, let's continue. Next, we take the number 20,782,465 and divide it by 2:
20,782,465 ÷ 2 = 10,391,232.5
If the quotient is a whole number, then 2 and 10,391,232.5 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 | 20,782,465 | |
| -1 | -20,782,465 |
Now, we try dividing 20,782,465 by 3:
20,782,465 ÷ 3 = 6,927,488.3333
If the quotient is a whole number, then 3 and 6,927,488.3333 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 | 20,782,465 | |
| -1 | -20,782,465 |
Let's try dividing by 4:
20,782,465 ÷ 4 = 5,195,616.25
If the quotient is a whole number, then 4 and 5,195,616.25 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 | 20,782,465 | |
| -1 | 20,782,465 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 379 | 997 | 1,895 | 4,169 | 4,985 | 10,967 | 20,845 | 54,835 | 377,863 | 1,889,315 | 4,156,493 | 20,782,465 |
| -1 | -5 | -11 | -55 | -379 | -997 | -1,895 | -4,169 | -4,985 | -10,967 | -20,845 | -54,835 | -377,863 | -1,889,315 | -4,156,493 | -20,782,465 |
Here are some more numbers to try:
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