What is the Greatest Common Factor of 18915 and 18920?

Greatest common factor (GCF) of 18915 and 18920 is 5.

GCF(18915,18920) = 5

We will now calculate the prime factors of 18915 and 18920, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 18915 and 18920.

How to find the GCF of 18915 and 18920?

We will first find the prime factorization of 18915 and 18920. After we will calculate the factors of 18915 and 18920 and find the biggest common factor number .

Step-1: Prime Factorization of 18915

Prime factors of 18915 are 3, 5, 13, 97. Prime factorization of 18915 in exponential form is:

18915 = 3¹ × 5¹ × 13¹ × 97¹

Step-2: Prime Factorization of 18920

Prime factors of 18920 are 2, 5, 11, 43. Prime factorization of 18920 in exponential form is:

18920 = 2³ × 5¹ × 11¹ × 43¹

Step-3: Factors of 18915

List of positive integer factors of 18915 that divides 18915 without a remainder.

1, 3, 5, 13, 15, 39, 65, 97, 195, 291, 485, 1261, 1455, 3783, 6305

Step-4: Factors of 18920

List of positive integer factors of 18920 that divides 18915 without a remainder.

1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 43, 44, 55, 86, 88, 110, 172, 215, 220, 344, 430, 440, 473, 860, 946, 1720, 1892, 2365, 3784, 4730, 9460

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 18915 and 18920. The biggest common factor number is the GCF number.
So the greatest common factor 18915 and 18920 is 5.

Also check out the Least Common Multiple of 18915 and 18920