What is the Greatest Common Factor of 18909 and 18920?

Greatest common factor (GCF) of 18909 and 18920 is 11.

GCF(18909,18920) = 11

We will now calculate the prime factors of 18909 and 18920, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 18909 and 18920.

How to find the GCF of 18909 and 18920?

We will first find the prime factorization of 18909 and 18920. After we will calculate the factors of 18909 and 18920 and find the biggest common factor number .

Step-1: Prime Factorization of 18909

Prime factors of 18909 are 3, 11, 191. Prime factorization of 18909 in exponential form is:

18909 = 3² × 11¹ × 191¹

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 18909

List of positive integer factors of 18909 that divides 18909 without a remainder.

1, 3, 9, 11, 33, 99, 191, 573, 1719, 2101, 6303

Step-4: Factors of 18920

List of positive integer factors of 18920 that divides 18909 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 18909 and 18920. The biggest common factor number is the GCF number.
So the greatest common factor 18909 and 18920 is 11.

Also check out the Least Common Multiple of 18909 and 18920