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13 and 7
The composite numbers up to 20 are 4,6,8,9,12,14,15,16,18 and 20.
The first 20 odd numbers are: 13579111315171921232527293133353739.
Twenty factorial which is denoted by "20!". 20! = 1x2x3x4x5x6x7x8x...x19x20
20 + 20 + 20 = 60The three identical numbers which add up to 60 are 20