81921780

素因数分解:

$2^2\times 3^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{829}}^1$

素因数の和:911

約数の個数: 120

約数和(自身を含む): 261519720

約数和(自身を除く): 179597940

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 61, 81, 90, 108, 122, 135, 162, 180, 183, 244, 270, 305, 324, 366, 405, 540, 549, 610, 732, 810, 829, 915, 1098, 1220, 1620, 1647, 1658, 1830, 2196, 2487, 2745, 3294, 3316, 3660, 4145, 4941, 4974, 5490, 6588, 7461, 8235, 8290, 9882, 9948, 10980, 12435, 14922, 16470, 16580, 19764, 22383, 24705, 24870, 29844, 32940, 37305, 44766, 49410, 49740, 50569, 67149, 74610, 89532, 98820, 101138, 111915, 134298, 149220, 151707, 202276, 223830, 252845, 268596, 303414, 335745, 447660, 455121, 505690, 606828, 671490, 758535, 910242, 1011380, 1342980, 1365363, 1517070, 1820484, 2275605, 2730726, 3034140, 4096089, 4551210, 5461452, 6826815, 8192178, 9102420, 13653630, 16384356, 20480445, 27307260, 40960890, 81921780]

約数ペア:

[(1, 81921780), (2, 40960890), (3, 27307260), (4, 20480445), (5, 16384356), (6, 13653630), (9, 9102420), (10, 8192178), (12, 6826815), (15, 5461452), (18, 4551210), (20, 4096089), (27, 3034140), (30, 2730726), (36, 2275605), (45, 1820484), (54, 1517070), (60, 1365363), (61, 1342980), (81, 1011380), (90, 910242), (108, 758535), (122, 671490), (135, 606828), (162, 505690), (180, 455121), (183, 447660), (244, 335745), (270, 303414), (305, 268596), (324, 252845), (366, 223830), (405, 202276), (540, 151707), (549, 149220), (610, 134298), (732, 111915), (810, 101138), (829, 98820), (915, 89532), (1098, 74610), (1220, 67149), (1620, 50569), (1647, 49740), (1658, 49410), (1830, 44766), (2196, 37305), (2487, 32940), (2745, 29844), (3294, 24870), (3316, 24705), (3660, 22383), (4145, 19764), (4941, 16580), (4974, 16470), (5490, 14922), (6588, 12435), (7461, 10980), (8235, 9948), (8290, 9882)]