What is the Greatest Common Factor of 61605 and 61620?

Greatest common factor (GCF) of 61605 and 61620 is 15.

GCF(61605,61620) = 15

We will now calculate the prime factors of 61605 and 61620, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 61605 and 61620.

How to find the GCF of 61605 and 61620?

We will first find the prime factorization of 61605 and 61620. After we will calculate the factors of 61605 and 61620 and find the biggest common factor number .

Step-1: Prime Factorization of 61605

Prime factors of 61605 are 3, 5, 37. Prime factorization of 61605 in exponential form is:

61605 = 3² × 5¹ × 37²

Step-2: Prime Factorization of 61620

Prime factors of 61620 are 2, 3, 5, 13, 79. Prime factorization of 61620 in exponential form is:

61620 = 2² × 3¹ × 5¹ × 13¹ × 79¹

Step-3: Factors of 61605

List of positive integer factors of 61605 that divides 61605 without a remainder.

1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555, 1369, 1665, 4107, 6845, 12321, 20535

Step-4: Factors of 61620

List of positive integer factors of 61620 that divides 61605 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 79, 130, 156, 158, 195, 237, 260, 316, 390, 395, 474, 780, 790, 948, 1027, 1185, 1580, 2054, 2370, 3081, 4108, 4740, 5135, 6162, 10270, 12324, 15405, 20540, 30810

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 61605 and 61620. The biggest common factor number is the GCF number.
So the greatest common factor 61605 and 61620 is 15.

Also check out the Least Common Multiple of 61605 and 61620