81878020

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{67}}^1$

素因数の和:162

約数の個数: 144

約数和(自身を含む): 214885440

約数和(自身を除く): 133007420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 43, 49, 58, 67, 70, 86, 98, 116, 134, 140, 145, 172, 196, 203, 215, 245, 268, 290, 301, 335, 406, 430, 469, 490, 580, 602, 670, 812, 860, 938, 980, 1015, 1204, 1247, 1340, 1421, 1505, 1876, 1943, 2030, 2107, 2345, 2494, 2842, 2881, 3010, 3283, 3886, 4060, 4214, 4690, 4988, 5684, 5762, 6020, 6235, 6566, 7105, 7772, 8428, 8729, 9380, 9715, 10535, 11524, 12470, 13132, 13601, 14210, 14405, 16415, 17458, 19430, 20167, 21070, 24940, 27202, 28420, 28810, 32830, 34916, 38860, 40334, 42140, 43645, 54404, 57620, 61103, 65660, 68005, 80668, 83549, 87290, 95207, 100835, 122206, 136010, 141169, 167098, 174580, 190414, 201670, 244412, 272020, 282338, 305515, 334196, 380828, 403340, 417745, 476035, 564676, 584843, 611030, 705845, 835490, 952070, 1169686, 1222060, 1411690, 1670980, 1904140, 2339372, 2823380, 2924215, 4093901, 5848430, 8187802, 11696860, 16375604, 20469505, 40939010, 81878020]

約数ペア:

[(1, 81878020), (2, 40939010), (4, 20469505), (5, 16375604), (7, 11696860), (10, 8187802), (14, 5848430), (20, 4093901), (28, 2924215), (29, 2823380), (35, 2339372), (43, 1904140), (49, 1670980), (58, 1411690), (67, 1222060), (70, 1169686), (86, 952070), (98, 835490), (116, 705845), (134, 611030), (140, 584843), (145, 564676), (172, 476035), (196, 417745), (203, 403340), (215, 380828), (245, 334196), (268, 305515), (290, 282338), (301, 272020), (335, 244412), (406, 201670), (430, 190414), (469, 174580), (490, 167098), (580, 141169), (602, 136010), (670, 122206), (812, 100835), (860, 95207), (938, 87290), (980, 83549), (1015, 80668), (1204, 68005), (1247, 65660), (1340, 61103), (1421, 57620), (1505, 54404), (1876, 43645), (1943, 42140), (2030, 40334), (2107, 38860), (2345, 34916), (2494, 32830), (2842, 28810), (2881, 28420), (3010, 27202), (3283, 24940), (3886, 21070), (4060, 20167), (4214, 19430), (4690, 17458), (4988, 16415), (5684, 14405), (5762, 14210), (6020, 13601), (6235, 13132), (6566, 12470), (7105, 11524), (7772, 10535), (8428, 9715), (8729, 9380)]