21042840

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1$

素因数の和:122

約数の個数: 256

約数和(自身を含む): 81285120

約数和(自身を除く): 60242280

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 13, 14, 15, 20, 21, 24, 26, 28, 30, 35, 39, 40, 41, 42, 47, 52, 56, 60, 65, 70, 78, 82, 84, 91, 94, 104, 105, 120, 123, 130, 140, 141, 156, 164, 168, 182, 188, 195, 205, 210, 235, 246, 260, 273, 280, 282, 287, 312, 328, 329, 364, 376, 390, 410, 420, 455, 470, 492, 520, 533, 546, 564, 574, 611, 615, 658, 705, 728, 780, 820, 840, 861, 910, 940, 984, 987, 1066, 1092, 1128, 1148, 1222, 1230, 1316, 1365, 1410, 1435, 1560, 1599, 1640, 1645, 1722, 1820, 1833, 1880, 1927, 1974, 2132, 2184, 2296, 2444, 2460, 2632, 2665, 2730, 2820, 2870, 3055, 3198, 3290, 3444, 3640, 3666, 3731, 3854, 3948, 4264, 4277, 4305, 4888, 4920, 4935, 5330, 5460, 5640, 5740, 5781, 6110, 6396, 6580, 6888, 7332, 7462, 7708, 7896, 7995, 8554, 8610, 9165, 9635, 9870, 10660, 10920, 11193, 11480, 11562, 12220, 12792, 12831, 13160, 13489, 14664, 14924, 15416, 15990, 17108, 17220, 18330, 18655, 19270, 19740, 21320, 21385, 22386, 23124, 24440, 25051, 25662, 26978, 28905, 29848, 31980, 34216, 34440, 36660, 37310, 38540, 39480, 40467, 42770, 44772, 46248, 50102, 51324, 53956, 55965, 57810, 63960, 64155, 67445, 73320, 74620, 75153, 77080, 80934, 85540, 89544, 100204, 102648, 107912, 111930, 115620, 125255, 128310, 134890, 149240, 150306, 161868, 171080, 175357, 200408, 202335, 223860, 231240, 250510, 256620, 269780, 300612, 323736, 350714, 375765, 404670, 447720, 501020, 513240, 526071, 539560, 601224, 701428, 751530, 809340, 876785, 1002040, 1052142, 1402856, 1503060, 1618680, 1753570, 2104284, 2630355, 3006120, 3507140, 4208568, 5260710, 7014280, 10521420, 21042840]

約数ペア:

[(1, 21042840), (2, 10521420), (3, 7014280), (4, 5260710), (5, 4208568), (6, 3507140), (7, 3006120), (8, 2630355), (10, 2104284), (12, 1753570), (13, 1618680), (14, 1503060), (15, 1402856), (20, 1052142), (21, 1002040), (24, 876785), (26, 809340), (28, 751530), (30, 701428), (35, 601224), (39, 539560), (40, 526071), (41, 513240), (42, 501020), (47, 447720), (52, 404670), (56, 375765), (60, 350714), (65, 323736), (70, 300612), (78, 269780), (82, 256620), (84, 250510), (91, 231240), (94, 223860), (104, 202335), (105, 200408), (120, 175357), (123, 171080), (130, 161868), (140, 150306), (141, 149240), (156, 134890), (164, 128310), (168, 125255), (182, 115620), (188, 111930), (195, 107912), (205, 102648), (210, 100204), (235, 89544), (246, 85540), (260, 80934), (273, 77080), (280, 75153), (282, 74620), (287, 73320), (312, 67445), (328, 64155), (329, 63960), (364, 57810), (376, 55965), (390, 53956), (410, 51324), (420, 50102), (455, 46248), (470, 44772), (492, 42770), (520, 40467), (533, 39480), (546, 38540), (564, 37310), (574, 36660), (611, 34440), (615, 34216), (658, 31980), (705, 29848), (728, 28905), (780, 26978), (820, 25662), (840, 25051), (861, 24440), (910, 23124), (940, 22386), (984, 21385), (987, 21320), (1066, 19740), (1092, 19270), (1128, 18655), (1148, 18330), (1222, 17220), (1230, 17108), (1316, 15990), (1365, 15416), (1410, 14924), (1435, 14664), (1560, 13489), (1599, 13160), (1640, 12831), (1645, 12792), (1722, 12220), (1820, 11562), (1833, 11480), (1880, 11193), (1927, 10920), (1974, 10660), (2132, 9870), (2184, 9635), (2296, 9165), (2444, 8610), (2460, 8554), (2632, 7995), (2665, 7896), (2730, 7708), (2820, 7462), (2870, 7332), (3055, 6888), (3198, 6580), (3290, 6396), (3444, 6110), (3640, 5781), (3666, 5740), (3731, 5640), (3854, 5460), (3948, 5330), (4264, 4935), (4277, 4920), (4305, 4888)]