What is the Greatest Common Factor of 21957 and 21966?

Greatest common factor (GCF) of 21957 and 21966 is 3.

GCF(21957,21966) = 3

We will now calculate the prime factors of 21957 and 21966, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21957 and 21966.

How to find the GCF of 21957 and 21966?

We will first find the prime factorization of 21957 and 21966. After we will calculate the factors of 21957 and 21966 and find the biggest common factor number .

Step-1: Prime Factorization of 21957

Prime factors of 21957 are 3, 13, 563. Prime factorization of 21957 in exponential form is:

21957 = 3¹ × 13¹ × 563¹

Step-2: Prime Factorization of 21966

Prime factors of 21966 are 2, 3, 7, 523. Prime factorization of 21966 in exponential form is:

21966 = 2¹ × 3¹ × 7¹ × 523¹

Step-3: Factors of 21957

List of positive integer factors of 21957 that divides 21957 without a remainder.

1, 3, 13, 39, 563, 1689, 7319

Step-4: Factors of 21966

List of positive integer factors of 21966 that divides 21957 without a remainder.

1, 2, 3, 6, 7, 14, 21, 42, 523, 1046, 1569, 3138, 3661, 7322, 10983

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21957 and 21966. The biggest common factor number is the GCF number.
So the greatest common factor 21957 and 21966 is 3.

Also check out the Least Common Multiple of 21957 and 21966