21202020

素因数分解:

$2^2\times 3^3\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1$

素因数の和:175

約数の個数: 192

約数和(自身を含む): 77414400

約数和(自身を除く): 56212380

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 27, 28, 30, 35, 36, 42, 45, 54, 60, 63, 70, 71, 79, 84, 90, 105, 108, 126, 135, 140, 142, 158, 180, 189, 210, 213, 237, 252, 270, 284, 315, 316, 355, 378, 395, 420, 426, 474, 497, 540, 553, 630, 639, 710, 711, 756, 790, 852, 945, 948, 994, 1065, 1106, 1185, 1260, 1278, 1420, 1422, 1491, 1580, 1659, 1890, 1917, 1988, 2130, 2133, 2212, 2370, 2485, 2556, 2765, 2844, 2982, 3195, 3318, 3555, 3780, 3834, 4260, 4266, 4473, 4740, 4970, 4977, 5530, 5609, 5964, 6390, 6636, 7110, 7455, 7668, 8295, 8532, 8946, 9585, 9940, 9954, 10665, 11060, 11218, 12780, 13419, 14220, 14910, 14931, 16590, 16827, 17892, 19170, 19908, 21330, 22365, 22436, 24885, 26838, 28045, 29820, 29862, 33180, 33654, 38340, 39263, 42660, 44730, 49770, 50481, 53676, 56090, 59724, 67095, 67308, 74655, 78526, 84135, 89460, 99540, 100962, 112180, 117789, 134190, 149310, 151443, 157052, 168270, 196315, 201924, 235578, 252405, 268380, 298620, 302886, 336540, 353367, 392630, 471156, 504810, 588945, 605772, 706734, 757215, 785260, 1009620, 1060101, 1177890, 1413468, 1514430, 1766835, 2120202, 2355780, 3028860, 3533670, 4240404, 5300505, 7067340, 10601010, 21202020]

約数ペア:

[(1, 21202020), (2, 10601010), (3, 7067340), (4, 5300505), (5, 4240404), (6, 3533670), (7, 3028860), (9, 2355780), (10, 2120202), (12, 1766835), (14, 1514430), (15, 1413468), (18, 1177890), (20, 1060101), (21, 1009620), (27, 785260), (28, 757215), (30, 706734), (35, 605772), (36, 588945), (42, 504810), (45, 471156), (54, 392630), (60, 353367), (63, 336540), (70, 302886), (71, 298620), (79, 268380), (84, 252405), (90, 235578), (105, 201924), (108, 196315), (126, 168270), (135, 157052), (140, 151443), (142, 149310), (158, 134190), (180, 117789), (189, 112180), (210, 100962), (213, 99540), (237, 89460), (252, 84135), (270, 78526), (284, 74655), (315, 67308), (316, 67095), (355, 59724), (378, 56090), (395, 53676), (420, 50481), (426, 49770), (474, 44730), (497, 42660), (540, 39263), (553, 38340), (630, 33654), (639, 33180), (710, 29862), (711, 29820), (756, 28045), (790, 26838), (852, 24885), (945, 22436), (948, 22365), (994, 21330), (1065, 19908), (1106, 19170), (1185, 17892), (1260, 16827), (1278, 16590), (1420, 14931), (1422, 14910), (1491, 14220), (1580, 13419), (1659, 12780), (1890, 11218), (1917, 11060), (1988, 10665), (2130, 9954), (2133, 9940), (2212, 9585), (2370, 8946), (2485, 8532), (2556, 8295), (2765, 7668), (2844, 7455), (2982, 7110), (3195, 6636), (3318, 6390), (3555, 5964), (3780, 5609), (3834, 5530), (4260, 4977), (4266, 4970), (4473, 4740)]