A:
Positive:
1 x 208689117 x 298127317 x 1227583119 x 175369157 x 1329231099 x 189891117 x 186832669 x 7819
Negative:
-1 x -20868911-7 x -2981273-17 x -1227583-119 x -175369-157 x -132923-1099 x -18989-1117 x -18683-2669 x -7819
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 20,868,911, 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 | 20,868,911 | |
| -1 | -20,868,911 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,868,911.
Example:
1 x 20,868,911 = 20,868,911
and
-1 x -20,868,911 = 20,868,911
Notice both answers equal 20,868,911
With that explanation out of the way, let's continue. Next, we take the number 20,868,911 and divide it by 2:
20,868,911 ÷ 2 = 10,434,455.5
If the quotient is a whole number, then 2 and 10,434,455.5 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 | 20,868,911 | |
| -1 | -20,868,911 |
Now, we try dividing 20,868,911 by 3:
20,868,911 ÷ 3 = 6,956,303.6667
If the quotient is a whole number, then 3 and 6,956,303.6667 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 | 20,868,911 | |
| -1 | -20,868,911 |
Let's try dividing by 4:
20,868,911 ÷ 4 = 5,217,227.75
If the quotient is a whole number, then 4 and 5,217,227.75 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 | 20,868,911 | |
| -1 | 20,868,911 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 119 | 157 | 1,099 | 1,117 | 2,669 | 7,819 | 18,683 | 18,989 | 132,923 | 175,369 | 1,227,583 | 2,981,273 | 20,868,911 |
| -1 | -7 | -17 | -119 | -157 | -1,099 | -1,117 | -2,669 | -7,819 | -18,683 | -18,989 | -132,923 | -175,369 | -1,227,583 | -2,981,273 | -20,868,911 |
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