A:
Positive:
1 x 200218697 x 286026717 x 1177757119 x 168251311 x 64379541 x 370092177 x 91973787 x 5287
Negative:
-1 x -20021869-7 x -2860267-17 x -1177757-119 x -168251-311 x -64379-541 x -37009-2177 x -9197-3787 x -5287
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 20,021,869, 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 | 20,021,869 | |
| -1 | -20,021,869 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,021,869.
Example:
1 x 20,021,869 = 20,021,869
and
-1 x -20,021,869 = 20,021,869
Notice both answers equal 20,021,869
With that explanation out of the way, let's continue. Next, we take the number 20,021,869 and divide it by 2:
20,021,869 ÷ 2 = 10,010,934.5
If the quotient is a whole number, then 2 and 10,010,934.5 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 | 20,021,869 | |
| -1 | -20,021,869 |
Now, we try dividing 20,021,869 by 3:
20,021,869 ÷ 3 = 6,673,956.3333
If the quotient is a whole number, then 3 and 6,673,956.3333 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 | 20,021,869 | |
| -1 | -20,021,869 |
Let's try dividing by 4:
20,021,869 ÷ 4 = 5,005,467.25
If the quotient is a whole number, then 4 and 5,005,467.25 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 | 20,021,869 | |
| -1 | 20,021,869 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 119 | 311 | 541 | 2,177 | 3,787 | 5,287 | 9,197 | 37,009 | 64,379 | 168,251 | 1,177,757 | 2,860,267 | 20,021,869 |
| -1 | -7 | -17 | -119 | -311 | -541 | -2,177 | -3,787 | -5,287 | -9,197 | -37,009 | -64,379 | -168,251 | -1,177,757 | -2,860,267 | -20,021,869 |
Here are some more numbers to try:
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