Find the LCM of Three Numbers: 5, 10, and 20

To find the least common multiple (LCM) of $5$, $10$, and $20$, find their prime factorizations:

$5 = 5$

$10 = 2 \, \times \, 5$

$20 = 2^2 \, \times \, 5$

$\times$The LCM is determined by selecting the greatest power of each prime number:

$2^2$ from 20 and $5$.

The LCM is $2^2 \, \times \, 5 = 4 \, \times \, 5 = 20$.