What is the Greatest Common Factor of 81908 and 81920?

Greatest common factor (GCF) of 81908 and 81920 is 4.

GCF(81908,81920) = 4

We will now calculate the prime factors of 81908 and 81920, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81908 and 81920.

How to find the GCF of 81908 and 81920?

We will first find the prime factorization of 81908 and 81920. After we will calculate the factors of 81908 and 81920 and find the biggest common factor number .

Step-1: Prime Factorization of 81908

Prime factors of 81908 are 2, 20477. Prime factorization of 81908 in exponential form is:

81908 = 2² × 20477¹

Step-2: Prime Factorization of 81920

Prime factors of 81920 are 2, 5. Prime factorization of 81920 in exponential form is:

81920 = 2¹⁴ × 5¹

Step-3: Factors of 81908

List of positive integer factors of 81908 that divides 81908 without a remainder.

1, 2, 4, 20477, 40954

Step-4: Factors of 81920

List of positive integer factors of 81920 that divides 81908 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 2048, 2560, 4096, 5120, 8192, 10240, 16384, 20480, 40960

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81908 and 81920. The biggest common factor number is the GCF number.
So the greatest common factor 81908 and 81920 is 4.

Also check out the Least Common Multiple of 81908 and 81920