21115120

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{257}}^1$

素因数の和:362

約数の個数: 80

約数和(自身を含む): 53746560

約数和(自身を除く): 32631440

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 79, 80, 104, 130, 158, 208, 257, 260, 316, 395, 514, 520, 632, 790, 1027, 1028, 1040, 1264, 1285, 1580, 2054, 2056, 2570, 3160, 3341, 4108, 4112, 5135, 5140, 6320, 6682, 8216, 10270, 10280, 13364, 16432, 16705, 20303, 20540, 20560, 26728, 33410, 40606, 41080, 53456, 66820, 81212, 82160, 101515, 133640, 162424, 203030, 263939, 267280, 324848, 406060, 527878, 812120, 1055756, 1319695, 1624240, 2111512, 2639390, 4223024, 5278780, 10557560, 21115120]

約数ペア:

[(1, 21115120), (2, 10557560), (4, 5278780), (5, 4223024), (8, 2639390), (10, 2111512), (13, 1624240), (16, 1319695), (20, 1055756), (26, 812120), (40, 527878), (52, 406060), (65, 324848), (79, 267280), (80, 263939), (104, 203030), (130, 162424), (158, 133640), (208, 101515), (257, 82160), (260, 81212), (316, 66820), (395, 53456), (514, 41080), (520, 40606), (632, 33410), (790, 26728), (1027, 20560), (1028, 20540), (1040, 20303), (1264, 16705), (1285, 16432), (1580, 13364), (2054, 10280), (2056, 10270), (2570, 8216), (3160, 6682), (3341, 6320), (4108, 5140), (4112, 5135)]