What is the Greatest Common Factor of 20440 and 20455?

Greatest common factor (GCF) of 20440 and 20455 is 5.

GCF(20440,20455) = 5

We will now calculate the prime factors of 20440 and 20455, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20440 and 20455.

How to find the GCF of 20440 and 20455?

We will first find the prime factorization of 20440 and 20455. After we will calculate the factors of 20440 and 20455 and find the biggest common factor number .

Step-1: Prime Factorization of 20440

Prime factors of 20440 are 2, 5, 7, 73. Prime factorization of 20440 in exponential form is:

20440 = 2³ × 5¹ × 7¹ × 73¹

Step-2: Prime Factorization of 20455

Prime factors of 20455 are 5, 4091. Prime factorization of 20455 in exponential form is:

20455 = 5¹ × 4091¹

Step-3: Factors of 20440

List of positive integer factors of 20440 that divides 20440 without a remainder.

1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 73, 140, 146, 280, 292, 365, 511, 584, 730, 1022, 1460, 2044, 2555, 2920, 4088, 5110, 10220

Step-4: Factors of 20455

List of positive integer factors of 20455 that divides 20440 without a remainder.

1, 5, 4091

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20440 and 20455. The biggest common factor number is the GCF number.
So the greatest common factor 20440 and 20455 is 5.

Also check out the Least Common Multiple of 20440 and 20455