What is the Greatest Common Factor of 2405 and 2420?

Greatest common factor (GCF) of 2405 and 2420 is 5.

GCF(2405,2420) = 5

We will now calculate the prime factors of 2405 and 2420, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 2405 and 2420.

How to find the GCF of 2405 and 2420?

We will first find the prime factorization of 2405 and 2420. After we will calculate the factors of 2405 and 2420 and find the biggest common factor number .

Step-1: Prime Factorization of 2405

Prime factors of 2405 are 5, 13, 37. Prime factorization of 2405 in exponential form is:

2405 = 5¹ × 13¹ × 37¹

Step-2: Prime Factorization of 2420

Prime factors of 2420 are 2, 5, 11. Prime factorization of 2420 in exponential form is:

2420 = 2² × 5¹ × 11²

Step-3: Factors of 2405

List of positive integer factors of 2405 that divides 2405 without a remainder.

1, 5, 13, 37, 65, 185, 481

Step-4: Factors of 2420

List of positive integer factors of 2420 that divides 2405 without a remainder.

1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 121, 220, 242, 484, 605, 1210

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 2405 and 2420. The biggest common factor number is the GCF number.
So the greatest common factor 2405 and 2420 is 5.

Also check out the Least Common Multiple of 2405 and 2420