What is the Least Common Multiple of 21968 and 21980?

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 21968 and 21980 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21968 and 21980, than apply into the LCM equation.

GCF(21968,21980) = 4
LCM(21968,21980) = ( 21968 × 21980) / 4
LCM(21968,21980) = 482856640 / 4
LCM(21968,21980) = 120714160

Least Common Multiple (LCM) of 21968 and 21980 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21968 and 21980. First we will calculate the prime factors of 21968 and 21980.

Prime Factorization of 21968

Prime Factorization of 21980

Now multiplying the highest exponent prime factors to calculate the LCM of 21968 and 21980.

LCM(21968,21980) = 2⁴ × 1373¹ × 5¹ × 7¹ × 157¹
LCM(21968,21980) = 120714160