What is the Greatest Common Factor of 21670 and 21688?

Greatest common factor (GCF) of 21670 and 21688 is 2.

GCF(21670,21688) = 2

We will now calculate the prime factors of 21670 and 21688, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21670 and 21688.

How to find the GCF of 21670 and 21688?

We will first find the prime factorization of 21670 and 21688. After we will calculate the factors of 21670 and 21688 and find the biggest common factor number .

Step-1: Prime Factorization of 21670

Prime factors of 21670 are 2, 5, 11, 197. Prime factorization of 21670 in exponential form is:

21670 = 2¹ × 5¹ × 11¹ × 197¹

Step-2: Prime Factorization of 21688

Prime factors of 21688 are 2, 2711. Prime factorization of 21688 in exponential form is:

21688 = 2³ × 2711¹

Step-3: Factors of 21670

List of positive integer factors of 21670 that divides 21670 without a remainder.

1, 2, 5, 10, 11, 22, 55, 110, 197, 394, 985, 1970, 2167, 4334, 10835

Step-4: Factors of 21688

List of positive integer factors of 21688 that divides 21670 without a remainder.

1, 2, 4, 8, 2711, 5422, 10844

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21670 and 21688. The biggest common factor number is the GCF number.
So the greatest common factor 21670 and 21688 is 2.

Also check out the Least Common Multiple of 21670 and 21688