What is the Greatest Common Factor of 2005 and 2015?

Greatest common factor (GCF) of 2005 and 2015 is 5.

GCF(2005,2015) = 5

We will now calculate the prime factors of 2005 and 2015, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 2005 and 2015.

How to find the GCF of 2005 and 2015?

We will first find the prime factorization of 2005 and 2015. After we will calculate the factors of 2005 and 2015 and find the biggest common factor number .

Step-1: Prime Factorization of 2005

Prime factors of 2005 are 5, 401. Prime factorization of 2005 in exponential form is:

2005 = 5¹ × 401¹

Step-2: Prime Factorization of 2015

Prime factors of 2015 are 5, 13, 31. Prime factorization of 2015 in exponential form is:

2015 = 5¹ × 13¹ × 31¹

Step-3: Factors of 2005

List of positive integer factors of 2005 that divides 2005 without a remainder.

1, 5, 401

Step-4: Factors of 2015

List of positive integer factors of 2015 that divides 2005 without a remainder.

1, 5, 13, 31, 65, 155, 403

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 2005 and 2015. The biggest common factor number is the GCF number.
So the greatest common factor 2005 and 2015 is 5.

Also check out the Least Common Multiple of 2005 and 2015