What is the Least Common Multiple of 17972 and 17990?

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 17972 and 17990 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 17972 and 17990, than apply into the LCM equation.

GCF(17972,17990) = 2
LCM(17972,17990) = ( 17972 × 17990) / 2
LCM(17972,17990) = 323316280 / 2
LCM(17972,17990) = 161658140

Least Common Multiple (LCM) of 17972 and 17990 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 17972 and 17990. First we will calculate the prime factors of 17972 and 17990.

Prime Factorization of 17972

Prime Factorization of 17990

Now multiplying the highest exponent prime factors to calculate the LCM of 17972 and 17990.

LCM(17972,17990) = 2² × 4493¹ × 5¹ × 7¹ × 257¹
LCM(17972,17990) = 161658140