What is the Greatest Common Factor of 20385 and 20391?

Greatest common factor (GCF) of 20385 and 20391 is 3.

GCF(20385,20391) = 3

We will now calculate the prime factors of 20385 and 20391, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20385 and 20391.

How to find the GCF of 20385 and 20391?

We will first find the prime factorization of 20385 and 20391. After we will calculate the factors of 20385 and 20391 and find the biggest common factor number .

Step-1: Prime Factorization of 20385

Prime factors of 20385 are 3, 5, 151. Prime factorization of 20385 in exponential form is:

20385 = 3³ × 5¹ × 151¹

Step-2: Prime Factorization of 20391

Prime factors of 20391 are 3, 7, 971. Prime factorization of 20391 in exponential form is:

20391 = 3¹ × 7¹ × 971¹

Step-3: Factors of 20385

List of positive integer factors of 20385 that divides 20385 without a remainder.

1, 3, 5, 9, 15, 27, 45, 135, 151, 453, 755, 1359, 2265, 4077, 6795

Step-4: Factors of 20391

List of positive integer factors of 20391 that divides 20385 without a remainder.

1, 3, 7, 21, 971, 2913, 6797

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20385 and 20391. The biggest common factor number is the GCF number.
So the greatest common factor 20385 and 20391 is 3.

Also check out the Least Common Multiple of 20385 and 20391