20981520

素因数分解:

$2^4\times 3^2\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{181}}^1$

素因数の和:230

約数の個数: 240

約数和(自身を含む): 84494592

約数和(自身を除く): 63513072

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 23, 24, 28, 30, 35, 36, 40, 42, 45, 46, 48, 56, 60, 63, 69, 70, 72, 80, 84, 90, 92, 105, 112, 115, 120, 126, 138, 140, 144, 161, 168, 180, 181, 184, 207, 210, 230, 240, 252, 276, 280, 315, 322, 336, 345, 360, 362, 368, 414, 420, 460, 483, 504, 543, 552, 560, 630, 644, 690, 720, 724, 805, 828, 840, 905, 920, 966, 1008, 1035, 1086, 1104, 1260, 1267, 1288, 1380, 1448, 1449, 1610, 1629, 1656, 1680, 1810, 1840, 1932, 2070, 2172, 2415, 2520, 2534, 2576, 2715, 2760, 2896, 2898, 3220, 3258, 3312, 3620, 3801, 3864, 4140, 4163, 4344, 4830, 5040, 5068, 5430, 5520, 5796, 6335, 6440, 6516, 7240, 7245, 7602, 7728, 8145, 8280, 8326, 8688, 9660, 10136, 10860, 11403, 11592, 12489, 12670, 12880, 13032, 14480, 14490, 15204, 16290, 16560, 16652, 19005, 19320, 20272, 20815, 21720, 22806, 23184, 24978, 25340, 26064, 28980, 29141, 30408, 32580, 33304, 37467, 38010, 38640, 41630, 43440, 45612, 49956, 50680, 57015, 57960, 58282, 60816, 62445, 65160, 66608, 74934, 76020, 83260, 87423, 91224, 99912, 101360, 114030, 115920, 116564, 124890, 130320, 145705, 149868, 152040, 166520, 174846, 182448, 187335, 199824, 228060, 233128, 249780, 262269, 291410, 299736, 304080, 333040, 349692, 374670, 437115, 456120, 466256, 499560, 524538, 582820, 599472, 699384, 749340, 874230, 912240, 999120, 1049076, 1165640, 1311345, 1398768, 1498680, 1748460, 2098152, 2331280, 2622690, 2997360, 3496920, 4196304, 5245380, 6993840, 10490760, 20981520]

約数ペア:

[(1, 20981520), (2, 10490760), (3, 6993840), (4, 5245380), (5, 4196304), (6, 3496920), (7, 2997360), (8, 2622690), (9, 2331280), (10, 2098152), (12, 1748460), (14, 1498680), (15, 1398768), (16, 1311345), (18, 1165640), (20, 1049076), (21, 999120), (23, 912240), (24, 874230), (28, 749340), (30, 699384), (35, 599472), (36, 582820), (40, 524538), (42, 499560), (45, 466256), (46, 456120), (48, 437115), (56, 374670), (60, 349692), (63, 333040), (69, 304080), (70, 299736), (72, 291410), (80, 262269), (84, 249780), (90, 233128), (92, 228060), (105, 199824), (112, 187335), (115, 182448), (120, 174846), (126, 166520), (138, 152040), (140, 149868), (144, 145705), (161, 130320), (168, 124890), (180, 116564), (181, 115920), (184, 114030), (207, 101360), (210, 99912), (230, 91224), (240, 87423), (252, 83260), (276, 76020), (280, 74934), (315, 66608), (322, 65160), (336, 62445), (345, 60816), (360, 58282), (362, 57960), (368, 57015), (414, 50680), (420, 49956), (460, 45612), (483, 43440), (504, 41630), (543, 38640), (552, 38010), (560, 37467), (630, 33304), (644, 32580), (690, 30408), (720, 29141), (724, 28980), (805, 26064), (828, 25340), (840, 24978), (905, 23184), (920, 22806), (966, 21720), (1008, 20815), (1035, 20272), (1086, 19320), (1104, 19005), (1260, 16652), (1267, 16560), (1288, 16290), (1380, 15204), (1448, 14490), (1449, 14480), (1610, 13032), (1629, 12880), (1656, 12670), (1680, 12489), (1810, 11592), (1840, 11403), (1932, 10860), (2070, 10136), (2172, 9660), (2415, 8688), (2520, 8326), (2534, 8280), (2576, 8145), (2715, 7728), (2760, 7602), (2896, 7245), (2898, 7240), (3220, 6516), (3258, 6440), (3312, 6335), (3620, 5796), (3801, 5520), (3864, 5430), (4140, 5068), (4163, 5040), (4344, 4830)]