What is the Greatest Common Factor of 15540 and 15555?

Greatest common factor (GCF) of 15540 and 15555 is 15.

GCF(15540,15555) = 15

We will now calculate the prime factors of 15540 and 15555, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15540 and 15555.

How to find the GCF of 15540 and 15555?

We will first find the prime factorization of 15540 and 15555. After we will calculate the factors of 15540 and 15555 and find the biggest common factor number .

Step-1: Prime Factorization of 15540

Prime factors of 15540 are 2, 3, 5, 7, 37. Prime factorization of 15540 in exponential form is:

15540 = 2² × 3¹ × 5¹ × 7¹ × 37¹

Step-2: Prime Factorization of 15555

Prime factors of 15555 are 3, 5, 17, 61. Prime factorization of 15555 in exponential form is:

15555 = 3¹ × 5¹ × 17¹ × 61¹

Step-3: Factors of 15540

List of positive integer factors of 15540 that divides 15540 without a remainder.

1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 37, 42, 60, 70, 74, 84, 105, 111, 140, 148, 185, 210, 222, 259, 370, 420, 444, 518, 555, 740, 777, 1036, 1110, 1295, 1554, 2220, 2590, 3108, 3885, 5180, 7770

Step-4: Factors of 15555

List of positive integer factors of 15555 that divides 15540 without a remainder.

1, 3, 5, 15, 17, 51, 61, 85, 183, 255, 305, 915, 1037, 3111, 5185

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15540 and 15555. The biggest common factor number is the GCF number.
So the greatest common factor 15540 and 15555 is 15.

Also check out the Least Common Multiple of 15540 and 15555