What is the Greatest Common Factor of 21680 and 21684?

Greatest common factor (GCF) of 21680 and 21684 is 4.

GCF(21680,21684) = 4

We will now calculate the prime factors of 21680 and 21684, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21680 and 21684.

How to find the GCF of 21680 and 21684?

We will first find the prime factorization of 21680 and 21684. After we will calculate the factors of 21680 and 21684 and find the biggest common factor number .

Step-1: Prime Factorization of 21680

Prime factors of 21680 are 2, 5, 271. Prime factorization of 21680 in exponential form is:

21680 = 2⁴ × 5¹ × 271¹

Step-2: Prime Factorization of 21684

Prime factors of 21684 are 2, 3, 13, 139. Prime factorization of 21684 in exponential form is:

21684 = 2² × 3¹ × 13¹ × 139¹

Step-3: Factors of 21680

List of positive integer factors of 21680 that divides 21680 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 271, 542, 1084, 1355, 2168, 2710, 4336, 5420, 10840

Step-4: Factors of 21684

List of positive integer factors of 21684 that divides 21680 without a remainder.

1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 139, 156, 278, 417, 556, 834, 1668, 1807, 3614, 5421, 7228, 10842

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21680 and 21684. The biggest common factor number is the GCF number.
So the greatest common factor 21680 and 21684 is 4.

Also check out the Least Common Multiple of 21680 and 21684