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①20=20×1=19+1,N的最小值為:219=524288,②20=2×10=(9+1)×(1+1),N的最小值為:29×3=1536,③20=4×5=(4+1)×(3+1),N的最小值為:24×33=432,④20=2×2×5=(4+1)×(1+1)×(1+1),N的最小值為:24×31×51=240,故答案為:240.
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