What is the Greatest Common Factor of 1320 and 1329?

Greatest common factor (GCF) of 1320 and 1329 is 3.

GCF(1320,1329) = 3

We will now calculate the prime factors of 1320 and 1329, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1320 and 1329.

How to find the GCF of 1320 and 1329?

We will first find the prime factorization of 1320 and 1329. After we will calculate the factors of 1320 and 1329 and find the biggest common factor number .

Step-1: Prime Factorization of 1320

Prime factors of 1320 are 2, 3, 5, 11. Prime factorization of 1320 in exponential form is:

1320 = 2³ × 3¹ × 5¹ × 11¹

Step-2: Prime Factorization of 1329

Prime factors of 1329 are 3, 443. Prime factorization of 1329 in exponential form is:

1329 = 3¹ × 443¹

Step-3: Factors of 1320

List of positive integer factors of 1320 that divides 1320 without a remainder.

1, 2, 3, 4, 5, 6, 8, 10, 11, 12, 15, 20, 22, 24, 30, 33, 40, 44, 55, 60, 66, 88, 110, 120, 132, 165, 220, 264, 330, 440, 660

Step-4: Factors of 1329

List of positive integer factors of 1329 that divides 1320 without a remainder.

1, 3, 443

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1320 and 1329. The biggest common factor number is the GCF number.
So the greatest common factor 1320 and 1329 is 3.

Also check out the Least Common Multiple of 1320 and 1329