What is the Greatest Common Factor of 28720 and 28740?

Greatest common factor (GCF) of 28720 and 28740 is 20.

GCF(28720,28740) = 20

We will now calculate the prime factors of 28720 and 28740, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 28720 and 28740.

How to find the GCF of 28720 and 28740?

We will first find the prime factorization of 28720 and 28740. After we will calculate the factors of 28720 and 28740 and find the biggest common factor number .

Step-1: Prime Factorization of 28720

Prime factors of 28720 are 2, 5, 359. Prime factorization of 28720 in exponential form is:

28720 = 2⁴ × 5¹ × 359¹

Step-2: Prime Factorization of 28740

Prime factors of 28740 are 2, 3, 5, 479. Prime factorization of 28740 in exponential form is:

28740 = 2² × 3¹ × 5¹ × 479¹

Step-3: Factors of 28720

List of positive integer factors of 28720 that divides 28720 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 359, 718, 1436, 1795, 2872, 3590, 5744, 7180, 14360

Step-4: Factors of 28740

List of positive integer factors of 28740 that divides 28720 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 479, 958, 1437, 1916, 2395, 2874, 4790, 5748, 7185, 9580, 14370

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 28720 and 28740. The biggest common factor number is the GCF number.
So the greatest common factor 28720 and 28740 is 20.

Also check out the Least Common Multiple of 28720 and 28740