81403980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{101}}^2$

素因数の和:240

約数の個数: 144

約数和(自身を含む): 276944640

約数和(自身を除く): 195540660

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 19, 20, 21, 28, 30, 35, 38, 42, 57, 60, 70, 76, 84, 95, 101, 105, 114, 133, 140, 190, 202, 210, 228, 266, 285, 303, 380, 399, 404, 420, 505, 532, 570, 606, 665, 707, 798, 1010, 1140, 1212, 1330, 1414, 1515, 1596, 1919, 1995, 2020, 2121, 2660, 2828, 3030, 3535, 3838, 3990, 4242, 5757, 6060, 7070, 7676, 7980, 8484, 9595, 10201, 10605, 11514, 13433, 14140, 19190, 20402, 21210, 23028, 26866, 28785, 30603, 38380, 40299, 40804, 42420, 51005, 53732, 57570, 61206, 67165, 71407, 80598, 102010, 115140, 122412, 134330, 142814, 153015, 161196, 193819, 201495, 204020, 214221, 268660, 285628, 306030, 357035, 387638, 402990, 428442, 581457, 612060, 714070, 775276, 805980, 856884, 969095, 1071105, 1162914, 1356733, 1428140, 1938190, 2142210, 2325828, 2713466, 2907285, 3876380, 4070199, 4284420, 5426932, 5814570, 6783665, 8140398, 11629140, 13567330, 16280796, 20350995, 27134660, 40701990, 81403980]

約数ペア:

[(1, 81403980), (2, 40701990), (3, 27134660), (4, 20350995), (5, 16280796), (6, 13567330), (7, 11629140), (10, 8140398), (12, 6783665), (14, 5814570), (15, 5426932), (19, 4284420), (20, 4070199), (21, 3876380), (28, 2907285), (30, 2713466), (35, 2325828), (38, 2142210), (42, 1938190), (57, 1428140), (60, 1356733), (70, 1162914), (76, 1071105), (84, 969095), (95, 856884), (101, 805980), (105, 775276), (114, 714070), (133, 612060), (140, 581457), (190, 428442), (202, 402990), (210, 387638), (228, 357035), (266, 306030), (285, 285628), (303, 268660), (380, 214221), (399, 204020), (404, 201495), (420, 193819), (505, 161196), (532, 153015), (570, 142814), (606, 134330), (665, 122412), (707, 115140), (798, 102010), (1010, 80598), (1140, 71407), (1212, 67165), (1330, 61206), (1414, 57570), (1515, 53732), (1596, 51005), (1919, 42420), (1995, 40804), (2020, 40299), (2121, 38380), (2660, 30603), (2828, 28785), (3030, 26866), (3535, 23028), (3838, 21210), (3990, 20402), (4242, 19190), (5757, 14140), (6060, 13433), (7070, 11514), (7676, 10605), (7980, 10201), (8484, 9595)]