20645680

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{809}}^1$

素因数の和:862

約数の個数: 80

約数和(自身を含む): 54237600

約数和(自身を除く): 33591920

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 29, 40, 44, 55, 58, 80, 88, 110, 116, 145, 176, 220, 232, 290, 319, 440, 464, 580, 638, 809, 880, 1160, 1276, 1595, 1618, 2320, 2552, 3190, 3236, 4045, 5104, 6380, 6472, 8090, 8899, 12760, 12944, 16180, 17798, 23461, 25520, 32360, 35596, 44495, 46922, 64720, 71192, 88990, 93844, 117305, 142384, 177980, 187688, 234610, 258071, 355960, 375376, 469220, 516142, 711920, 938440, 1032284, 1290355, 1876880, 2064568, 2580710, 4129136, 5161420, 10322840, 20645680]

約数ペア:

[(1, 20645680), (2, 10322840), (4, 5161420), (5, 4129136), (8, 2580710), (10, 2064568), (11, 1876880), (16, 1290355), (20, 1032284), (22, 938440), (29, 711920), (40, 516142), (44, 469220), (55, 375376), (58, 355960), (80, 258071), (88, 234610), (110, 187688), (116, 177980), (145, 142384), (176, 117305), (220, 93844), (232, 88990), (290, 71192), (319, 64720), (440, 46922), (464, 44495), (580, 35596), (638, 32360), (809, 25520), (880, 23461), (1160, 17798), (1276, 16180), (1595, 12944), (1618, 12760), (2320, 8899), (2552, 8090), (3190, 6472), (3236, 6380), (4045, 5104)]