Q: What are the factor combinations of the number 20,415,571?

 A:
Positive:   1 x 2041557111 x 1855961
Negative: -1 x -20415571-11 x -1855961


How do I find the factor combinations of the number 20,415,571?

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 20,415,571, it is easier to work with a table - it's called factoring from the outside in.

Outside in Factoring

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 20,415,571
-1 -20,415,571

Why are the negative numbers included?

When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,415,571.

Example:
1 x 20,415,571 = 20,415,571
and
-1 x -20,415,571 = 20,415,571
Notice both answers equal 20,415,571

With that explanation out of the way, let's continue. Next, we take the number 20,415,571 and divide it by 2:

20,415,571 ÷ 2 = 10,207,785.5

If the quotient is a whole number, then 2 and 10,207,785.5 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 20,415,571
-1 -20,415,571

Now, we try dividing 20,415,571 by 3:

20,415,571 ÷ 3 = 6,805,190.3333

If the quotient is a whole number, then 3 and 6,805,190.3333 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 20,415,571
-1 -20,415,571

Let's try dividing by 4:

20,415,571 ÷ 4 = 5,103,892.75

If the quotient is a whole number, then 4 and 5,103,892.75 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 20,415,571
-1 20,415,571
Keep dividing by the next highest number until you cannot divide anymore.

If you did it right, you will end up with this table:

1111,855,96120,415,571
-1-11-1,855,961-20,415,571

More Examples

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