A:
Positive:
1 x 206513655 x 41302737 x 295019535 x 59003937 x 558145185 x 111629259 x 79735431 x 479151295 x 159471369 x 150852155 x 95833017 x 6845
Negative:
-1 x -20651365-5 x -4130273-7 x -2950195-35 x -590039-37 x -558145-185 x -111629-259 x -79735-431 x -47915-1295 x -15947-1369 x -15085-2155 x -9583-3017 x -6845
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 20,651,365, 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 | 20,651,365 | |
| -1 | -20,651,365 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,651,365.
Example:
1 x 20,651,365 = 20,651,365
and
-1 x -20,651,365 = 20,651,365
Notice both answers equal 20,651,365
With that explanation out of the way, let's continue. Next, we take the number 20,651,365 and divide it by 2:
20,651,365 ÷ 2 = 10,325,682.5
If the quotient is a whole number, then 2 and 10,325,682.5 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 | 20,651,365 | |
| -1 | -20,651,365 |
Now, we try dividing 20,651,365 by 3:
20,651,365 ÷ 3 = 6,883,788.3333
If the quotient is a whole number, then 3 and 6,883,788.3333 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 | 20,651,365 | |
| -1 | -20,651,365 |
Let's try dividing by 4:
20,651,365 ÷ 4 = 5,162,841.25
If the quotient is a whole number, then 4 and 5,162,841.25 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 | 20,651,365 | |
| -1 | 20,651,365 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 37 | 185 | 259 | 431 | 1,295 | 1,369 | 2,155 | 3,017 | 6,845 | 9,583 | 15,085 | 15,947 | 47,915 | 79,735 | 111,629 | 558,145 | 590,039 | 2,950,195 | 4,130,273 | 20,651,365 |
| -1 | -5 | -7 | -35 | -37 | -185 | -259 | -431 | -1,295 | -1,369 | -2,155 | -3,017 | -6,845 | -9,583 | -15,085 | -15,947 | -47,915 | -79,735 | -111,629 | -558,145 | -590,039 | -2,950,195 | -4,130,273 | -20,651,365 |
Here are some more numbers to try:
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