A:
Positive:
1 x 200420455 x 400840929 x 69110567 x 299135145 x 138221335 x 598271943 x 103152063 x 9715
Negative:
-1 x -20042045-5 x -4008409-29 x -691105-67 x -299135-145 x -138221-335 x -59827-1943 x -10315-2063 x -9715
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 20,042,045, 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 | 20,042,045 | |
| -1 | -20,042,045 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,042,045.
Example:
1 x 20,042,045 = 20,042,045
and
-1 x -20,042,045 = 20,042,045
Notice both answers equal 20,042,045
With that explanation out of the way, let's continue. Next, we take the number 20,042,045 and divide it by 2:
20,042,045 ÷ 2 = 10,021,022.5
If the quotient is a whole number, then 2 and 10,021,022.5 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 | 20,042,045 | |
| -1 | -20,042,045 |
Now, we try dividing 20,042,045 by 3:
20,042,045 ÷ 3 = 6,680,681.6667
If the quotient is a whole number, then 3 and 6,680,681.6667 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 | 20,042,045 | |
| -1 | -20,042,045 |
Let's try dividing by 4:
20,042,045 ÷ 4 = 5,010,511.25
If the quotient is a whole number, then 4 and 5,010,511.25 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 | 20,042,045 | |
| -1 | 20,042,045 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 67 | 145 | 335 | 1,943 | 2,063 | 9,715 | 10,315 | 59,827 | 138,221 | 299,135 | 691,105 | 4,008,409 | 20,042,045 |
| -1 | -5 | -29 | -67 | -145 | -335 | -1,943 | -2,063 | -9,715 | -10,315 | -59,827 | -138,221 | -299,135 | -691,105 | -4,008,409 | -20,042,045 |
Here are some more numbers to try:
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