What is the Least Common Multiple of 21620 and 21640?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 21620 and 21640 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21620 and 21640, than apply into the LCM equation.

GCF(21620,21640) = 20
LCM(21620,21640) = ( 21620 × 21640) / 20
LCM(21620,21640) = 467856800 / 20
LCM(21620,21640) = 23392840

Least Common Multiple (LCM) of 21620 and 21640 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21620 and 21640. First we will calculate the prime factors of 21620 and 21640.

Prime Factorization of 21620

Prime Factorization of 21640

Now multiplying the highest exponent prime factors to calculate the LCM of 21620 and 21640.

LCM(21620,21640) = 2³ × 5¹ × 23¹ × 47¹ × 541¹
LCM(21620,21640) = 23392840