What is the Greatest Common Factor of 1580 and 1585?

Greatest common factor (GCF) of 1580 and 1585 is 5.

GCF(1580,1585) = 5

We will now calculate the prime factors of 1580 and 1585, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1580 and 1585.

How to find the GCF of 1580 and 1585?

We will first find the prime factorization of 1580 and 1585. After we will calculate the factors of 1580 and 1585 and find the biggest common factor number .

Step-1: Prime Factorization of 1580

Prime factors of 1580 are 2, 5, 79. Prime factorization of 1580 in exponential form is:

1580 = 2² × 5¹ × 79¹

Step-2: Prime Factorization of 1585

Prime factors of 1585 are 5, 317. Prime factorization of 1585 in exponential form is:

1585 = 5¹ × 317¹

Step-3: Factors of 1580

List of positive integer factors of 1580 that divides 1580 without a remainder.

1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790

Step-4: Factors of 1585

List of positive integer factors of 1585 that divides 1580 without a remainder.

1, 5, 317

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1580 and 1585. The biggest common factor number is the GCF number.
So the greatest common factor 1580 and 1585 is 5.

Also check out the Least Common Multiple of 1580 and 1585