What is the Greatest Common Factor of 1720 and 1740?

Greatest common factor (GCF) of 1720 and 1740 is 20.

GCF(1720,1740) = 20

We will now calculate the prime factors of 1720 and 1740, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1720 and 1740.

How to find the GCF of 1720 and 1740?

We will first find the prime factorization of 1720 and 1740. After we will calculate the factors of 1720 and 1740 and find the biggest common factor number .

Step-1: Prime Factorization of 1720

Prime factors of 1720 are 2, 5, 43. Prime factorization of 1720 in exponential form is:

1720 = 2³ × 5¹ × 43¹

Step-2: Prime Factorization of 1740

Prime factors of 1740 are 2, 3, 5, 29. Prime factorization of 1740 in exponential form is:

1740 = 2² × 3¹ × 5¹ × 29¹

Step-3: Factors of 1720

List of positive integer factors of 1720 that divides 1720 without a remainder.

1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860

Step-4: Factors of 1740

List of positive integer factors of 1740 that divides 1720 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 29, 30, 58, 60, 87, 116, 145, 174, 290, 348, 435, 580, 870

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1720 and 1740. The biggest common factor number is the GCF number.
So the greatest common factor 1720 and 1740 is 20.

Also check out the Least Common Multiple of 1720 and 1740