There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
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A common denominator, though not the least, is 80.
80
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To subtract these fractions, you need to find a common denominator. The least common multiple of 16 and 20 is 80. Converting 5/16 and 3/20 to have a denominator of 80, we have 25/80 and 12/80. Subtracting 12/80 from 25/80 gives us 13/80 as the result.
The Least Common Multiple (LCM) for 4 16 and 20 is 80.