What is the Greatest Common Factor of 81212 and 81220?

Greatest common factor (GCF) of 81212 and 81220 is 4.

GCF(81212,81220) = 4

We will now calculate the prime factors of 81212 and 81220, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81212 and 81220.

How to find the GCF of 81212 and 81220?

We will first find the prime factorization of 81212 and 81220. After we will calculate the factors of 81212 and 81220 and find the biggest common factor number .

Step-1: Prime Factorization of 81212

Prime factors of 81212 are 2, 79, 257. Prime factorization of 81212 in exponential form is:

81212 = 2² × 79¹ × 257¹

Step-2: Prime Factorization of 81220

Prime factors of 81220 are 2, 5, 31, 131. Prime factorization of 81220 in exponential form is:

81220 = 2² × 5¹ × 31¹ × 131¹

Step-3: Factors of 81212

List of positive integer factors of 81212 that divides 81212 without a remainder.

1, 2, 4, 79, 158, 257, 316, 514, 1028, 20303, 40606

Step-4: Factors of 81220

List of positive integer factors of 81220 that divides 81212 without a remainder.

1, 2, 4, 5, 10, 20, 31, 62, 124, 131, 155, 262, 310, 524, 620, 655, 1310, 2620, 4061, 8122, 16244, 20305, 40610

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81212 and 81220. The biggest common factor number is the GCF number.
So the greatest common factor 81212 and 81220 is 4.

Also check out the Least Common Multiple of 81212 and 81220