No, 4 is a factor of 20.
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To be a multiple of 4, 10 and 20 the number must be a multiple of their lowest common multiple. lcm(4, 10, 20) = 20 What is required is a multiple of 20 between 61 and 107. The numbers 80 and 100 both satisfy the problem of being between 61 and 107 and being a multiple of 4, 10 and 20.
The least common multiple of 4 , 6 , 20 = 60
The least common multiple of 19 , 4 , 20 = 380
The Least Common Multiple (LCM) for 4 16 and 20 is 80.
least common multiple of 4 20 36 is 180.