What is the Greatest Common Factor of 20439 and 20457?

Greatest common factor (GCF) of 20439 and 20457 is 9.

GCF(20439,20457) = 9

We will now calculate the prime factors of 20439 and 20457, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20439 and 20457.

How to find the GCF of 20439 and 20457?

We will first find the prime factorization of 20439 and 20457. After we will calculate the factors of 20439 and 20457 and find the biggest common factor number .

Step-1: Prime Factorization of 20439

Prime factors of 20439 are 3, 757. Prime factorization of 20439 in exponential form is:

20439 = 3³ × 757¹

Step-2: Prime Factorization of 20457

Prime factors of 20457 are 3, 2273. Prime factorization of 20457 in exponential form is:

20457 = 3² × 2273¹

Step-3: Factors of 20439

List of positive integer factors of 20439 that divides 20439 without a remainder.

1, 3, 9, 27, 757, 2271, 6813

Step-4: Factors of 20457

List of positive integer factors of 20457 that divides 20439 without a remainder.

1, 3, 9, 2273, 6819

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20439 and 20457. The biggest common factor number is the GCF number.
So the greatest common factor 20439 and 20457 is 9.

Also check out the Least Common Multiple of 20439 and 20457