A:
Positive:
1 x 201518082 x 100759044 x 50379528 x 251897616 x 125948832 x 62974464 x 314872128 x 157436256 x 78718512 x 39359
Negative:
-1 x -20151808-2 x -10075904-4 x -5037952-8 x -2518976-16 x -1259488-32 x -629744-64 x -314872-128 x -157436-256 x -78718-512 x -39359
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 20,151,808, 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 | 20,151,808 | |
| -1 | -20,151,808 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,151,808.
Example:
1 x 20,151,808 = 20,151,808
and
-1 x -20,151,808 = 20,151,808
Notice both answers equal 20,151,808
With that explanation out of the way, let's continue. Next, we take the number 20,151,808 and divide it by 2:
20,151,808 ÷ 2 = 10,075,904
If the quotient is a whole number, then 2 and 10,075,904 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
| 1 | 2 | 10,075,904 | 20,151,808 | |
| -1 | -2 | -10,075,904 | -20,151,808 |
Now, we try dividing 20,151,808 by 3:
20,151,808 ÷ 3 = 6,717,269.3333
If the quotient is a whole number, then 3 and 6,717,269.3333 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 | 2 | 10,075,904 | 20,151,808 | |
| -1 | -2 | -10,075,904 | -20,151,808 |
Let's try dividing by 4:
20,151,808 ÷ 4 = 5,037,952
If the quotient is a whole number, then 4 and 5,037,952 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
| 1 | 2 | 4 | 5,037,952 | 10,075,904 | 20,151,808 | |
| -1 | -2 | -4 | -5,037,952 | -10,075,904 | 20,151,808 |
If you did it right, you will end up with this table:
| 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128 | 256 | 512 | 39,359 | 78,718 | 157,436 | 314,872 | 629,744 | 1,259,488 | 2,518,976 | 5,037,952 | 10,075,904 | 20,151,808 |
| -1 | -2 | -4 | -8 | -16 | -32 | -64 | -128 | -256 | -512 | -39,359 | -78,718 | -157,436 | -314,872 | -629,744 | -1,259,488 | -2,518,976 | -5,037,952 | -10,075,904 | -20,151,808 |
Here are some more numbers to try:
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