A:
Positive:
1 x 205405137 x 293435937 x 55514971 x 289303259 x 79307497 x 413291117 x 183892627 x 7819
Negative:
-1 x -20540513-7 x -2934359-37 x -555149-71 x -289303-259 x -79307-497 x -41329-1117 x -18389-2627 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 20,540,513, 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 | 20,540,513 | |
| -1 | -20,540,513 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,540,513.
Example:
1 x 20,540,513 = 20,540,513
and
-1 x -20,540,513 = 20,540,513
Notice both answers equal 20,540,513
With that explanation out of the way, let's continue. Next, we take the number 20,540,513 and divide it by 2:
20,540,513 ÷ 2 = 10,270,256.5
If the quotient is a whole number, then 2 and 10,270,256.5 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 | 20,540,513 | |
| -1 | -20,540,513 |
Now, we try dividing 20,540,513 by 3:
20,540,513 ÷ 3 = 6,846,837.6667
If the quotient is a whole number, then 3 and 6,846,837.6667 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 | 20,540,513 | |
| -1 | -20,540,513 |
Let's try dividing by 4:
20,540,513 ÷ 4 = 5,135,128.25
If the quotient is a whole number, then 4 and 5,135,128.25 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 | 20,540,513 | |
| -1 | 20,540,513 |
If you did it right, you will end up with this table:
| 1 | 7 | 37 | 71 | 259 | 497 | 1,117 | 2,627 | 7,819 | 18,389 | 41,329 | 79,307 | 289,303 | 555,149 | 2,934,359 | 20,540,513 |
| -1 | -7 | -37 | -71 | -259 | -497 | -1,117 | -2,627 | -7,819 | -18,389 | -41,329 | -79,307 | -289,303 | -555,149 | -2,934,359 | -20,540,513 |
Here are some more numbers to try:
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