What is the Greatest Common Factor of 42805 and 42820?

Greatest common factor (GCF) of 42805 and 42820 is 5.

GCF(42805,42820) = 5

We will now calculate the prime factors of 42805 and 42820, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 42805 and 42820.

How to find the GCF of 42805 and 42820?

We will first find the prime factorization of 42805 and 42820. After we will calculate the factors of 42805 and 42820 and find the biggest common factor number .

Step-1: Prime Factorization of 42805

Prime factors of 42805 are 5, 7, 1223. Prime factorization of 42805 in exponential form is:

42805 = 5¹ × 7¹ × 1223¹

Step-2: Prime Factorization of 42820

Prime factors of 42820 are 2, 5, 2141. Prime factorization of 42820 in exponential form is:

42820 = 2² × 5¹ × 2141¹

Step-3: Factors of 42805

List of positive integer factors of 42805 that divides 42805 without a remainder.

1, 5, 7, 35, 1223, 6115, 8561

Step-4: Factors of 42820

List of positive integer factors of 42820 that divides 42805 without a remainder.

1, 2, 4, 5, 10, 20, 2141, 4282, 8564, 10705, 21410

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 42805 and 42820. The biggest common factor number is the GCF number.
So the greatest common factor 42805 and 42820 is 5.

Also check out the Least Common Multiple of 42805 and 42820