50 = 2 * 6 + 2 * 9 + 1 * 20

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 49 = 1 * 9 + 2 * 20
 48 = 2 * 6 + 4 * 9
 47 = 3 * 9 + 1 * 20
 46 = 1 * 6 + 2 * 20
 45 = 5 * 9
 44 = 1 * 6 + 2 * 9 + 1 * 20
 43

no solution!

 42 = 1 * 6 + 4 * 9
 41 = 2 * 6 + 1 * 9 + 1 * 20
 40 = 2 * 20
 39 = 2 * 6 + 3 * 9
 38 = 2 * 9 + 1 * 20
 37

no solution!

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