What is the Greatest Common Factor of 21897 and 21906?

Greatest common factor (GCF) of 21897 and 21906 is 9.

GCF(21897,21906) = 9

We will now calculate the prime factors of 21897 and 21906, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21897 and 21906.

How to find the GCF of 21897 and 21906?

We will first find the prime factorization of 21897 and 21906. After we will calculate the factors of 21897 and 21906 and find the biggest common factor number .

Step-1: Prime Factorization of 21897

Prime factors of 21897 are 3, 811. Prime factorization of 21897 in exponential form is:

21897 = 3³ × 811¹

Step-2: Prime Factorization of 21906

Prime factors of 21906 are 2, 3, 1217. Prime factorization of 21906 in exponential form is:

21906 = 2¹ × 3² × 1217¹

Step-3: Factors of 21897

List of positive integer factors of 21897 that divides 21897 without a remainder.

1, 3, 9, 27, 811, 2433, 7299

Step-4: Factors of 21906

List of positive integer factors of 21906 that divides 21897 without a remainder.

1, 2, 3, 6, 9, 18, 1217, 2434, 3651, 7302, 10953

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21897 and 21906. The biggest common factor number is the GCF number.
So the greatest common factor 21897 and 21906 is 9.

Also check out the Least Common Multiple of 21897 and 21906