21440

素因数分解:

$2^6\times 5^1\times {\mathrm{67}}^1$

素因数の和:84

約数の個数: 28

約数和(自身を含む): 51816

約数和(自身を除く): 30376

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 67, 80, 134, 160, 268, 320, 335, 536, 670, 1072, 1340, 2144, 2680, 4288, 5360, 10720, 21440]

約数ペア:

[(1, 21440), (2, 10720), (4, 5360), (5, 4288), (8, 2680), (10, 2144), (16, 1340), (20, 1072), (32, 670), (40, 536), (64, 335), (67, 320), (80, 268), (134, 160)]