21991788

素因数分解:

$2^2\times 3^2\times 7^3\times {\mathrm{13}}^1\times {\mathrm{137}}^1$

素因数の和:181

約数の個数: 144

約数和(自身を含む): 70324800

約数和(自身を除く): 48333012

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 13, 14, 18, 21, 26, 28, 36, 39, 42, 49, 52, 63, 78, 84, 91, 98, 117, 126, 137, 147, 156, 182, 196, 234, 252, 273, 274, 294, 343, 364, 411, 441, 468, 546, 548, 588, 637, 686, 819, 822, 882, 959, 1029, 1092, 1233, 1274, 1372, 1638, 1644, 1764, 1781, 1911, 1918, 2058, 2466, 2548, 2877, 3087, 3276, 3562, 3822, 3836, 4116, 4459, 4932, 5343, 5733, 5754, 6174, 6713, 7124, 7644, 8631, 8918, 10686, 11466, 11508, 12348, 12467, 13377, 13426, 16029, 17262, 17836, 20139, 21372, 22932, 24934, 26754, 26852, 32058, 34524, 37401, 40131, 40278, 46991, 49868, 53508, 60417, 64116, 74802, 80262, 80556, 87269, 93982, 112203, 120834, 140973, 149604, 160524, 174538, 187964, 224406, 241668, 261807, 281946, 349076, 422919, 448812, 523614, 563892, 610883, 785421, 845838, 1047228, 1221766, 1570842, 1691676, 1832649, 2443532, 3141684, 3665298, 5497947, 7330596, 10995894, 21991788]

約数ペア:

[(1, 21991788), (2, 10995894), (3, 7330596), (4, 5497947), (6, 3665298), (7, 3141684), (9, 2443532), (12, 1832649), (13, 1691676), (14, 1570842), (18, 1221766), (21, 1047228), (26, 845838), (28, 785421), (36, 610883), (39, 563892), (42, 523614), (49, 448812), (52, 422919), (63, 349076), (78, 281946), (84, 261807), (91, 241668), (98, 224406), (117, 187964), (126, 174538), (137, 160524), (147, 149604), (156, 140973), (182, 120834), (196, 112203), (234, 93982), (252, 87269), (273, 80556), (274, 80262), (294, 74802), (343, 64116), (364, 60417), (411, 53508), (441, 49868), (468, 46991), (546, 40278), (548, 40131), (588, 37401), (637, 34524), (686, 32058), (819, 26852), (822, 26754), (882, 24934), (959, 22932), (1029, 21372), (1092, 20139), (1233, 17836), (1274, 17262), (1372, 16029), (1638, 13426), (1644, 13377), (1764, 12467), (1781, 12348), (1911, 11508), (1918, 11466), (2058, 10686), (2466, 8918), (2548, 8631), (2877, 7644), (3087, 7124), (3276, 6713), (3562, 6174), (3822, 5754), (3836, 5733), (4116, 5343), (4459, 4932)]