# What is the Least Common Multiple of 20 and 33?

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 (LCM) of 20 and 33 is 660.

LCM(20,33) = 660

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## Least Common Multiple of 20 and 33 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 20 and 33, than apply into the LCM equation.

GCF(20,33) = 1
LCM(20,33) = ( 20 × 33) / 1
LCM(20,33) = 660 / 1
LCM(20,33) = 660

## Least Common Multiple (LCM) of 20 and 33 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 20 and 33. First we will calculate the prime factors of 20 and 33.

### Prime Factorization of 20

Prime factors of 20 are 2, 5. Prime factorization of 20 in exponential form is:

20 = 22 × 51

### Prime Factorization of 33

Prime factors of 33 are 3, 11. Prime factorization of 33 in exponential form is:

33 = 31 × 111

Now multiplying the highest exponent prime factors to calculate the LCM of 20 and 33.

LCM(20,33) = 22 × 51 × 31 × 111
LCM(20,33) = 660