LCM means least common multiple(link). It is the smallest number which is in the table of the given numbers.

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Find LCM of 4 & 6
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LCM of 4 & 6 = 2 × 2 × 3

= 12

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Find LCM of 12 & 16
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LCM of 12 & 16 = 2 × 2 × 2 × 2 × 3

= 4 × 4 × 3

= 48

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Find LCM of
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20, 28, 36
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LCM of 20, 28, 36 = 2 × 2 × 3 × 3 × 5 × 7

= 4 × 9 × 35

= 1260

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Find LCM of
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13 & 23
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LCM of 13 & 23 = 13 × 23

= 299