18, 19, 20
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Since 57/3 = 19, we know that the middle number has to be 19. The other numbers will be the numbers contiguous to 19. Therefore, the three consecutive numbers which add up to 57 are: 18 + 19 + 20 = 57
The numbers are 17, 19, and 21.
The product is 1254. The sum is 79.
The sum of the first 57 natural numbers is 1,625.