21608080

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{263}}^1$

素因数の和:368

約数の個数: 80

約数和(自身を含む): 54996480

約数和(自身を除く): 33388400

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 79, 80, 104, 130, 158, 208, 260, 263, 316, 395, 520, 526, 632, 790, 1027, 1040, 1052, 1264, 1315, 1580, 2054, 2104, 2630, 3160, 3419, 4108, 4208, 5135, 5260, 6320, 6838, 8216, 10270, 10520, 13676, 16432, 17095, 20540, 20777, 21040, 27352, 34190, 41080, 41554, 54704, 68380, 82160, 83108, 103885, 136760, 166216, 207770, 270101, 273520, 332432, 415540, 540202, 831080, 1080404, 1350505, 1662160, 2160808, 2701010, 4321616, 5402020, 10804040, 21608080]

約数ペア:

[(1, 21608080), (2, 10804040), (4, 5402020), (5, 4321616), (8, 2701010), (10, 2160808), (13, 1662160), (16, 1350505), (20, 1080404), (26, 831080), (40, 540202), (52, 415540), (65, 332432), (79, 273520), (80, 270101), (104, 207770), (130, 166216), (158, 136760), (208, 103885), (260, 83108), (263, 82160), (316, 68380), (395, 54704), (520, 41554), (526, 41080), (632, 34190), (790, 27352), (1027, 21040), (1040, 20777), (1052, 20540), (1264, 17095), (1315, 16432), (1580, 13676), (2054, 10520), (2104, 10270), (2630, 8216), (3160, 6838), (3419, 6320), (4108, 5260), (4208, 5135)]