What is the Greatest Common Factor of 20540 and 20558?

Greatest common factor (GCF) of 20540 and 20558 is 2.

GCF(20540,20558) = 2

We will now calculate the prime factors of 20540 and 20558, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20540 and 20558.

How to find the GCF of 20540 and 20558?

We will first find the prime factorization of 20540 and 20558. After we will calculate the factors of 20540 and 20558 and find the biggest common factor number .

Step-1: Prime Factorization of 20540

Prime factors of 20540 are 2, 5, 13, 79. Prime factorization of 20540 in exponential form is:

20540 = 2² × 5¹ × 13¹ × 79¹

Step-2: Prime Factorization of 20558

Prime factors of 20558 are 2, 19, 541. Prime factorization of 20558 in exponential form is:

20558 = 2¹ × 19¹ × 541¹

Step-3: Factors of 20540

List of positive integer factors of 20540 that divides 20540 without a remainder.

1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 79, 130, 158, 260, 316, 395, 790, 1027, 1580, 2054, 4108, 5135, 10270

Step-4: Factors of 20558

List of positive integer factors of 20558 that divides 20540 without a remainder.

1, 2, 19, 38, 541, 1082, 10279

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20540 and 20558. The biggest common factor number is the GCF number.
So the greatest common factor 20540 and 20558 is 2.

Also check out the Least Common Multiple of 20540 and 20558