What is the Greatest Common Factor of 30405 and 30420?

Greatest common factor (GCF) of 30405 and 30420 is 15.

GCF(30405,30420) = 15

We will now calculate the prime factors of 30405 and 30420, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 30405 and 30420.

How to find the GCF of 30405 and 30420?

We will first find the prime factorization of 30405 and 30420. After we will calculate the factors of 30405 and 30420 and find the biggest common factor number .

Step-1: Prime Factorization of 30405

Prime factors of 30405 are 3, 5, 2027. Prime factorization of 30405 in exponential form is:

30405 = 3¹ × 5¹ × 2027¹

Step-2: Prime Factorization of 30420

Prime factors of 30420 are 2, 3, 5, 13. Prime factorization of 30420 in exponential form is:

30420 = 2² × 3² × 5¹ × 13²

Step-3: Factors of 30405

List of positive integer factors of 30405 that divides 30405 without a remainder.

1, 3, 5, 15, 2027, 6081, 10135

Step-4: Factors of 30420

List of positive integer factors of 30420 that divides 30405 without a remainder.

1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 15, 18, 20, 26, 30, 36, 39, 45, 52, 60, 65, 78, 90, 117, 130, 156, 169, 180, 195, 234, 260, 338, 390, 468, 507, 585, 676, 780, 845, 1014, 1170, 1521, 1690, 2028, 2340, 2535, 3042, 3380, 5070, 6084, 7605, 10140, 15210

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 30405 and 30420. The biggest common factor number is the GCF number.
So the greatest common factor 30405 and 30420 is 15.

Also check out the Least Common Multiple of 30405 and 30420