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20 + 19 = 39The two consecutive numbers that add up to 39 are 19 and 20.
20 + 20 + 20 = 60The three identical numbers which add up to 60 are 20
The prime numbers of 20 are 2, 2 and 5. (2*2*5 = 20)
20 and 21
They are 18, 19 and 20.