Q: What is the prime factorization of the number 23,115,307?

 A:
  • The prime factors are: 541 x 42,727
    • or also written as { 541, 42,727 }
  • Written in exponential form: 5411 x 42,7271

Why is the prime factorization of 23,115,307 written as 5411 x 42,7271?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 23,115,307

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 23,115,307 by 2

23,115,307 ÷ 2 = 11,557,653.5 - This has a remainder. Let's try another prime number.
23,115,307 ÷ 3 = 7,705,102.3333 - This has a remainder. Let's try another prime number.
23,115,307 ÷ 5 = 4,623,061.4 - This has a remainder. Let's try another prime number.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
23,115,307 ÷ 541 = 42,727 - No remainder! 541 is one of the factors!
42,727 ÷ 541 = 78.9778 - There is a remainder. We can't divide by 541 evenly anymore. Let's try the next prime number
42,727 ÷ 547 = 78.1115 - This has a remainder. 547 is not a factor.
42,727 ÷ 557 = 76.7092 - This has a remainder. 557 is not a factor.
42,727 ÷ 563 = 75.8917 - This has a remainder. 563 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
42,727 ÷ 42,727 = 1 - No remainder! 42,727 is one of the factors!

The orange divisor(s) above are the prime factors of the number 23,115,307. If we put all of it together we have the factors 541 x 42,727 = 23,115,307. It can also be written in exponential form as 5411 x 42,7271.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 23,115,307.

23,115,307
Factor Arrows
54142,727

More Prime Factorization Examples

23,115,30523,115,30623,115,30823,115,309
51 x 191 x 311 x 471 x 167121 x 31 x 371 x 104,123122 x 171 x 411 x 8,291131 x 72 x 157,2471

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