What is the Greatest Common Factor of 1520 and 1535?

Greatest common factor (GCF) of 1520 and 1535 is 5.

GCF(1520,1535) = 5

We will now calculate the prime factors of 1520 and 1535, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1520 and 1535.

How to find the GCF of 1520 and 1535?

We will first find the prime factorization of 1520 and 1535. After we will calculate the factors of 1520 and 1535 and find the biggest common factor number .

Step-1: Prime Factorization of 1520

Prime factors of 1520 are 2, 5, 19. Prime factorization of 1520 in exponential form is:

1520 = 2⁴ × 5¹ × 19¹

Step-2: Prime Factorization of 1535

Prime factors of 1535 are 5, 307. Prime factorization of 1535 in exponential form is:

1535 = 5¹ × 307¹

Step-3: Factors of 1520

List of positive integer factors of 1520 that divides 1520 without a remainder.

1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 152, 190, 304, 380, 760

Step-4: Factors of 1535

List of positive integer factors of 1535 that divides 1520 without a remainder.

1, 5, 307

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1520 and 1535. The biggest common factor number is the GCF number.
So the greatest common factor 1520 and 1535 is 5.

Also check out the Least Common Multiple of 1520 and 1535