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20! is 2,432,902,008,176,640,000, so there are four consecutive zeroes at the end of 20!
The first two consecutive prime numbers that have a difference of 20 are the numbers 887 and 907.
The answer is 20*20 = 400
20 + 19 = 39The two consecutive numbers that add up to 39 are 19 and 20.
19, 20, 21