21128380

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{47}}^1$

素因数の和:108

約数の個数: 144

約数和(自身を含む): 59028480

約数和(自身を除く): 37900100

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 19, 20, 26, 28, 35, 38, 47, 52, 65, 70, 76, 91, 94, 95, 130, 133, 140, 169, 182, 188, 190, 235, 247, 260, 266, 329, 338, 364, 380, 455, 470, 494, 532, 611, 658, 665, 676, 845, 893, 910, 940, 988, 1183, 1222, 1235, 1316, 1330, 1645, 1690, 1729, 1786, 1820, 2366, 2444, 2470, 2660, 3055, 3211, 3290, 3380, 3458, 3572, 4277, 4465, 4732, 4940, 5915, 6110, 6251, 6422, 6580, 6916, 7943, 8554, 8645, 8930, 11609, 11830, 12220, 12502, 12844, 15886, 16055, 17108, 17290, 17860, 21385, 22477, 23218, 23660, 25004, 31255, 31772, 32110, 34580, 39715, 42770, 44954, 46436, 55601, 58045, 62510, 64220, 79430, 81263, 85540, 89908, 111202, 112385, 116090, 125020, 150917, 158860, 162526, 222404, 224770, 232180, 278005, 301834, 325052, 406315, 449540, 556010, 603668, 754585, 812630, 1056419, 1112020, 1509170, 1625260, 2112838, 3018340, 4225676, 5282095, 10564190, 21128380]

約数ペア:

[(1, 21128380), (2, 10564190), (4, 5282095), (5, 4225676), (7, 3018340), (10, 2112838), (13, 1625260), (14, 1509170), (19, 1112020), (20, 1056419), (26, 812630), (28, 754585), (35, 603668), (38, 556010), (47, 449540), (52, 406315), (65, 325052), (70, 301834), (76, 278005), (91, 232180), (94, 224770), (95, 222404), (130, 162526), (133, 158860), (140, 150917), (169, 125020), (182, 116090), (188, 112385), (190, 111202), (235, 89908), (247, 85540), (260, 81263), (266, 79430), (329, 64220), (338, 62510), (364, 58045), (380, 55601), (455, 46436), (470, 44954), (494, 42770), (532, 39715), (611, 34580), (658, 32110), (665, 31772), (676, 31255), (845, 25004), (893, 23660), (910, 23218), (940, 22477), (988, 21385), (1183, 17860), (1222, 17290), (1235, 17108), (1316, 16055), (1330, 15886), (1645, 12844), (1690, 12502), (1729, 12220), (1786, 11830), (1820, 11609), (2366, 8930), (2444, 8645), (2470, 8554), (2660, 7943), (3055, 6916), (3211, 6580), (3290, 6422), (3380, 6251), (3458, 6110), (3572, 5915), (4277, 4940), (4465, 4732)]