A:
Positive:
1 x 2078605111 x 188964113 x 1598927137 x 151723143 x 1453571061 x 195911507 x 137931781 x 11671
Negative:
-1 x -20786051-11 x -1889641-13 x -1598927-137 x -151723-143 x -145357-1061 x -19591-1507 x -13793-1781 x -11671
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 20,786,051, 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 | 20,786,051 | |
| -1 | -20,786,051 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,786,051.
Example:
1 x 20,786,051 = 20,786,051
and
-1 x -20,786,051 = 20,786,051
Notice both answers equal 20,786,051
With that explanation out of the way, let's continue. Next, we take the number 20,786,051 and divide it by 2:
20,786,051 ÷ 2 = 10,393,025.5
If the quotient is a whole number, then 2 and 10,393,025.5 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 | 20,786,051 | |
| -1 | -20,786,051 |
Now, we try dividing 20,786,051 by 3:
20,786,051 ÷ 3 = 6,928,683.6667
If the quotient is a whole number, then 3 and 6,928,683.6667 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 | 20,786,051 | |
| -1 | -20,786,051 |
Let's try dividing by 4:
20,786,051 ÷ 4 = 5,196,512.75
If the quotient is a whole number, then 4 and 5,196,512.75 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 | 20,786,051 | |
| -1 | 20,786,051 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 137 | 143 | 1,061 | 1,507 | 1,781 | 11,671 | 13,793 | 19,591 | 145,357 | 151,723 | 1,598,927 | 1,889,641 | 20,786,051 |
| -1 | -11 | -13 | -137 | -143 | -1,061 | -1,507 | -1,781 | -11,671 | -13,793 | -19,591 | -145,357 | -151,723 | -1,598,927 | -1,889,641 | -20,786,051 |
Here are some more numbers to try:
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