What is the Greatest Common Factor of 805 and 821?

Greatest common factor (GCF) of 805 and 821 is 1.

GCF(805,821) = 1

We will now calculate the prime factors of 805 and 821, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 805 and 821.

How to find the GCF of 805 and 821?

We will first find the prime factorization of 805 and 821. After we will calculate the factors of 805 and 821 and find the biggest common factor number .

Step-1: Prime Factorization of 805

Prime factors of 805 are 5, 7, 23. Prime factorization of 805 in exponential form is:

805 = 5¹ × 7¹ × 23¹

Step-2: Prime Factorization of 821

Prime factors of 821 are 821. Prime factorization of 821 in exponential form is:

821 = 821¹

Step-3: Factors of 805

List of positive integer factors of 805 that divides 805 without a remainder.

1, 5, 7, 23, 35, 115, 161

Step-4: Factors of 821

List of positive integer factors of 821 that divides 805 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 805 and 821. The biggest common factor number is the GCF number.
So the greatest common factor 805 and 821 is 1.

Also check out the Least Common Multiple of 805 and 821