What is the Greatest Common Factor of 1615 and 1620?

Greatest common factor (GCF) of 1615 and 1620 is 5.

GCF(1615,1620) = 5

We will now calculate the prime factors of 1615 and 1620, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1615 and 1620.

How to find the GCF of 1615 and 1620?

We will first find the prime factorization of 1615 and 1620. After we will calculate the factors of 1615 and 1620 and find the biggest common factor number .

Step-1: Prime Factorization of 1615

Prime factors of 1615 are 5, 17, 19. Prime factorization of 1615 in exponential form is:

1615 = 5¹ × 17¹ × 19¹

Step-2: Prime Factorization of 1620

Prime factors of 1620 are 2, 3, 5. Prime factorization of 1620 in exponential form is:

1620 = 2² × 3⁴ × 5¹

Step-3: Factors of 1615

List of positive integer factors of 1615 that divides 1615 without a remainder.

1, 5, 17, 19, 85, 95, 323

Step-4: Factors of 1620

List of positive integer factors of 1620 that divides 1615 without a remainder.

1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 108, 135, 162, 180, 270, 324, 405, 540, 810

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1615 and 1620. The biggest common factor number is the GCF number.
So the greatest common factor 1615 and 1620 is 5.

Also check out the Least Common Multiple of 1615 and 1620