A:
Positive:
1 x 2072725131 x 66862161 x 33979197 x 213683113 x 1834271891 x 109613007 x 68933503 x 5917
Negative:
-1 x -20727251-31 x -668621-61 x -339791-97 x -213683-113 x -183427-1891 x -10961-3007 x -6893-3503 x -5917
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 20,727,251, 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 | 20,727,251 | |
| -1 | -20,727,251 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,727,251.
Example:
1 x 20,727,251 = 20,727,251
and
-1 x -20,727,251 = 20,727,251
Notice both answers equal 20,727,251
With that explanation out of the way, let's continue. Next, we take the number 20,727,251 and divide it by 2:
20,727,251 ÷ 2 = 10,363,625.5
If the quotient is a whole number, then 2 and 10,363,625.5 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 | 20,727,251 | |
| -1 | -20,727,251 |
Now, we try dividing 20,727,251 by 3:
20,727,251 ÷ 3 = 6,909,083.6667
If the quotient is a whole number, then 3 and 6,909,083.6667 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 | 20,727,251 | |
| -1 | -20,727,251 |
Let's try dividing by 4:
20,727,251 ÷ 4 = 5,181,812.75
If the quotient is a whole number, then 4 and 5,181,812.75 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 | 20,727,251 | |
| -1 | 20,727,251 |
If you did it right, you will end up with this table:
| 1 | 31 | 61 | 97 | 113 | 1,891 | 3,007 | 3,503 | 5,917 | 6,893 | 10,961 | 183,427 | 213,683 | 339,791 | 668,621 | 20,727,251 |
| -1 | -31 | -61 | -97 | -113 | -1,891 | -3,007 | -3,503 | -5,917 | -6,893 | -10,961 | -183,427 | -213,683 | -339,791 | -668,621 | -20,727,251 |
Here are some more numbers to try:
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