80
/ \
40 2
/ \
20 2
/ \
10 2
/ \
5 2
24*5
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The prime factorization of 80 is: 2 x 2 x 2 x 2 x 5
80 2, 40 2, 2, 20 2, 2, 2, 10 2, 2, 2, 2, 5
80
Oh, dude, the least common multiple (LCM) of 8, 16, and 20 is 80. It's like the number that these three numbers can all divide into without leaving a remainder. So, if you ever need to find a number that these three can all agree on, it's 80. Cool, right?
80 and 189 are relatively prime as they have no common factors other than 1.