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The natural number n has 20 positive divisors, and the minimum value of n is______ ．
① 20 = 20 × 1 = 19 + 1, the minimum value of n is 219 = 524288, ② 20 = 2 × 10 = (9 + 1) × (1 + 1), the minimum value of n is 29 × 3 = 1536, ③ 20 = 4 × 5 = (4 + 1) × (3 + 1), the minimum value of n is 24 × 33 = 432, ④ 20 = 2 × 2 × 5 = (4 + 1) × (1 + 1), the minimum value of n is
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- 2. The natural number n has 20 positive divisors, and the minimum value of n is______ ．
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