A:
Positive:
1 x 206435355 x 412870711 x 187668523 x 89754555 x 375337115 x 179509253 x 815951265 x 16319
Negative:
-1 x -20643535-5 x -4128707-11 x -1876685-23 x -897545-55 x -375337-115 x -179509-253 x -81595-1265 x -16319
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 20,643,535, 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 | 20,643,535 | |
| -1 | -20,643,535 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,643,535.
Example:
1 x 20,643,535 = 20,643,535
and
-1 x -20,643,535 = 20,643,535
Notice both answers equal 20,643,535
With that explanation out of the way, let's continue. Next, we take the number 20,643,535 and divide it by 2:
20,643,535 ÷ 2 = 10,321,767.5
If the quotient is a whole number, then 2 and 10,321,767.5 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 | 20,643,535 | |
| -1 | -20,643,535 |
Now, we try dividing 20,643,535 by 3:
20,643,535 ÷ 3 = 6,881,178.3333
If the quotient is a whole number, then 3 and 6,881,178.3333 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 | 20,643,535 | |
| -1 | -20,643,535 |
Let's try dividing by 4:
20,643,535 ÷ 4 = 5,160,883.75
If the quotient is a whole number, then 4 and 5,160,883.75 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 | 20,643,535 | |
| -1 | 20,643,535 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 23 | 55 | 115 | 253 | 1,265 | 16,319 | 81,595 | 179,509 | 375,337 | 897,545 | 1,876,685 | 4,128,707 | 20,643,535 |
| -1 | -5 | -11 | -23 | -55 | -115 | -253 | -1,265 | -16,319 | -81,595 | -179,509 | -375,337 | -897,545 | -1,876,685 | -4,128,707 | -20,643,535 |
Here are some more numbers to try:
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