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The total number of cards is 20. These added up to 210. The lowest common multiple 0f 210 is 35.
6 x 35 = 210.
Each pile of cards must total 35 because there is not more than one of each number.
Pile 1 had 20, 1 and 14.
Pile 2 had 19, 10 and 6.
Pile 3 had 18, 12 and 5.
Pile 4 had 8,2,9 and 16.
Pile 5 had 7, 15 and 13.
Pile 6 had 4, 17, 3 and 11.