What is the Greatest Common Factor of 19911 and 19920?

Greatest common factor (GCF) of 19911 and 19920 is 3.

GCF(19911,19920) = 3

We will now calculate the prime factors of 19911 and 19920, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19911 and 19920.

How to find the GCF of 19911 and 19920?

We will first find the prime factorization of 19911 and 19920. After we will calculate the factors of 19911 and 19920 and find the biggest common factor number .

Step-1: Prime Factorization of 19911

Prime factors of 19911 are 3, 6637. Prime factorization of 19911 in exponential form is:

19911 = 3¹ × 6637¹

Step-2: Prime Factorization of 19920

Prime factors of 19920 are 2, 3, 5, 83. Prime factorization of 19920 in exponential form is:

19920 = 2⁴ × 3¹ × 5¹ × 83¹

Step-3: Factors of 19911

List of positive integer factors of 19911 that divides 19911 without a remainder.

1, 3, 6637

Step-4: Factors of 19920

List of positive integer factors of 19920 that divides 19911 without a remainder.

1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 83, 120, 166, 240, 249, 332, 415, 498, 664, 830, 996, 1245, 1328, 1660, 1992, 2490, 3320, 3984, 4980, 6640, 9960

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19911 and 19920. The biggest common factor number is the GCF number.
So the greatest common factor 19911 and 19920 is 3.

Also check out the Least Common Multiple of 19911 and 19920