A:
Positive:
1 x 2021090917 x 118887741 x 492949107 x 188887271 x 74579697 x 289971819 x 111114387 x 4607
Negative:
-1 x -20210909-17 x -1188877-41 x -492949-107 x -188887-271 x -74579-697 x -28997-1819 x -11111-4387 x -4607
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 20,210,909, 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 | 20,210,909 | |
| -1 | -20,210,909 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,210,909.
Example:
1 x 20,210,909 = 20,210,909
and
-1 x -20,210,909 = 20,210,909
Notice both answers equal 20,210,909
With that explanation out of the way, let's continue. Next, we take the number 20,210,909 and divide it by 2:
20,210,909 ÷ 2 = 10,105,454.5
If the quotient is a whole number, then 2 and 10,105,454.5 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 | 20,210,909 | |
| -1 | -20,210,909 |
Now, we try dividing 20,210,909 by 3:
20,210,909 ÷ 3 = 6,736,969.6667
If the quotient is a whole number, then 3 and 6,736,969.6667 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 | 20,210,909 | |
| -1 | -20,210,909 |
Let's try dividing by 4:
20,210,909 ÷ 4 = 5,052,727.25
If the quotient is a whole number, then 4 and 5,052,727.25 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 | 20,210,909 | |
| -1 | 20,210,909 |
If you did it right, you will end up with this table:
| 1 | 17 | 41 | 107 | 271 | 697 | 1,819 | 4,387 | 4,607 | 11,111 | 28,997 | 74,579 | 188,887 | 492,949 | 1,188,877 | 20,210,909 |
| -1 | -17 | -41 | -107 | -271 | -697 | -1,819 | -4,387 | -4,607 | -11,111 | -28,997 | -74,579 | -188,887 | -492,949 | -1,188,877 | -20,210,909 |
Here are some more numbers to try:
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