What is the Greatest Common Factor of 21940 and 21959?

Greatest common factor (GCF) of 21940 and 21959 is 1.

GCF(21940,21959) = 1

We will now calculate the prime factors of 21940 and 21959, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21940 and 21959.

How to find the GCF of 21940 and 21959?

We will first find the prime factorization of 21940 and 21959. After we will calculate the factors of 21940 and 21959 and find the biggest common factor number .

Step-1: Prime Factorization of 21940

Prime factors of 21940 are 2, 5, 1097. Prime factorization of 21940 in exponential form is:

21940 = 2² × 5¹ × 1097¹

Step-2: Prime Factorization of 21959

Prime factors of 21959 are 7, 3137. Prime factorization of 21959 in exponential form is:

21959 = 7¹ × 3137¹

Step-3: Factors of 21940

List of positive integer factors of 21940 that divides 21940 without a remainder.

1, 2, 4, 5, 10, 20, 1097, 2194, 4388, 5485, 10970

Step-4: Factors of 21959

List of positive integer factors of 21959 that divides 21940 without a remainder.

1, 7, 3137

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21940 and 21959. The biggest common factor number is the GCF number.
So the greatest common factor 21940 and 21959 is 1.

Also check out the Least Common Multiple of 21940 and 21959