What is the Greatest Common Factor of 9815 and 9820?

Greatest common factor (GCF) of 9815 and 9820 is 5.

GCF(9815,9820) = 5

We will now calculate the prime factors of 9815 and 9820, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 9815 and 9820.

How to find the GCF of 9815 and 9820?

We will first find the prime factorization of 9815 and 9820. After we will calculate the factors of 9815 and 9820 and find the biggest common factor number .

Step-1: Prime Factorization of 9815

Prime factors of 9815 are 5, 13, 151. Prime factorization of 9815 in exponential form is:

9815 = 5¹ × 13¹ × 151¹

Step-2: Prime Factorization of 9820

Prime factors of 9820 are 2, 5, 491. Prime factorization of 9820 in exponential form is:

9820 = 2² × 5¹ × 491¹

Step-3: Factors of 9815

List of positive integer factors of 9815 that divides 9815 without a remainder.

1, 5, 13, 65, 151, 755, 1963

Step-4: Factors of 9820

List of positive integer factors of 9820 that divides 9815 without a remainder.

1, 2, 4, 5, 10, 20, 491, 982, 1964, 2455, 4910

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 9815 and 9820. The biggest common factor number is the GCF number.
So the greatest common factor 9815 and 9820 is 5.

Also check out the Least Common Multiple of 9815 and 9820