What is the Greatest Common Factor of 28203 and 28221?

Greatest common factor (GCF) of 28203 and 28221 is 3.

GCF(28203,28221) = 3

We will now calculate the prime factors of 28203 and 28221, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 28203 and 28221.

How to find the GCF of 28203 and 28221?

We will first find the prime factorization of 28203 and 28221. After we will calculate the factors of 28203 and 28221 and find the biggest common factor number .

Step-1: Prime Factorization of 28203

Prime factors of 28203 are 3, 7, 17, 79. Prime factorization of 28203 in exponential form is:

28203 = 3¹ × 7¹ × 17¹ × 79¹

Step-2: Prime Factorization of 28221

Prime factors of 28221 are 3, 23, 409. Prime factorization of 28221 in exponential form is:

28221 = 3¹ × 23¹ × 409¹

Step-3: Factors of 28203

List of positive integer factors of 28203 that divides 28203 without a remainder.

1, 3, 7, 17, 21, 51, 79, 119, 237, 357, 553, 1343, 1659, 4029, 9401

Step-4: Factors of 28221

List of positive integer factors of 28221 that divides 28203 without a remainder.

1, 3, 23, 69, 409, 1227, 9407

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 28203 and 28221. The biggest common factor number is the GCF number.
So the greatest common factor 28203 and 28221 is 3.

Also check out the Least Common Multiple of 28203 and 28221