What is the Greatest Common Factor of 605 and 620?

Greatest common factor (GCF) of 605 and 620 is 5.

GCF(605,620) = 5

We will now calculate the prime factors of 605 and 620, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 605 and 620.

How to find the GCF of 605 and 620?

We will first find the prime factorization of 605 and 620. After we will calculate the factors of 605 and 620 and find the biggest common factor number .

Step-1: Prime Factorization of 605

Prime factors of 605 are 5, 11. Prime factorization of 605 in exponential form is:

605 = 5¹ × 11²

Step-2: Prime Factorization of 620

Prime factors of 620 are 2, 5, 31. Prime factorization of 620 in exponential form is:

620 = 2² × 5¹ × 31¹

Step-3: Factors of 605

List of positive integer factors of 605 that divides 605 without a remainder.

1, 5, 11, 55, 121

Step-4: Factors of 620

List of positive integer factors of 620 that divides 605 without a remainder.

1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 605 and 620. The biggest common factor number is the GCF number.
So the greatest common factor 605 and 620 is 5.

Also check out the Least Common Multiple of 605 and 620