What is the Least Common Multiple of 20990 and 21001?

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 20990 and 21001 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 20990 and 21001, than apply into the LCM equation.

GCF(20990,21001) = 1
LCM(20990,21001) = ( 20990 × 21001) / 1
LCM(20990,21001) = 440810990 / 1
LCM(20990,21001) = 440810990

Least Common Multiple (LCM) of 20990 and 21001 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 20990 and 21001. First we will calculate the prime factors of 20990 and 21001.

Prime Factorization of 20990

Prime Factorization of 21001

Now multiplying the highest exponent prime factors to calculate the LCM of 20990 and 21001.

LCM(20990,21001) = 2¹ × 5¹ × 2099¹ × 21001¹
LCM(20990,21001) = 440810990