19810980

素因数分解:

$2^2\times 3^4\times 5^1\times 7^1\times {\mathrm{1747}}^1$

素因数の和:1775

約数の個数: 120

約数和(自身を含む): 71066688

約数和(自身を除く): 51255708

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 27, 28, 30, 35, 36, 42, 45, 54, 60, 63, 70, 81, 84, 90, 105, 108, 126, 135, 140, 162, 180, 189, 210, 252, 270, 315, 324, 378, 405, 420, 540, 567, 630, 756, 810, 945, 1134, 1260, 1620, 1747, 1890, 2268, 2835, 3494, 3780, 5241, 5670, 6988, 8735, 10482, 11340, 12229, 15723, 17470, 20964, 24458, 26205, 31446, 34940, 36687, 47169, 48916, 52410, 61145, 62892, 73374, 78615, 94338, 104820, 110061, 122290, 141507, 146748, 157230, 183435, 188676, 220122, 235845, 244580, 283014, 314460, 330183, 366870, 440244, 471690, 550305, 566028, 660366, 707535, 733740, 943380, 990549, 1100610, 1320732, 1415070, 1650915, 1981098, 2201220, 2830140, 3301830, 3962196, 4952745, 6603660, 9905490, 19810980]

約数ペア:

[(1, 19810980), (2, 9905490), (3, 6603660), (4, 4952745), (5, 3962196), (6, 3301830), (7, 2830140), (9, 2201220), (10, 1981098), (12, 1650915), (14, 1415070), (15, 1320732), (18, 1100610), (20, 990549), (21, 943380), (27, 733740), (28, 707535), (30, 660366), (35, 566028), (36, 550305), (42, 471690), (45, 440244), (54, 366870), (60, 330183), (63, 314460), (70, 283014), (81, 244580), (84, 235845), (90, 220122), (105, 188676), (108, 183435), (126, 157230), (135, 146748), (140, 141507), (162, 122290), (180, 110061), (189, 104820), (210, 94338), (252, 78615), (270, 73374), (315, 62892), (324, 61145), (378, 52410), (405, 48916), (420, 47169), (540, 36687), (567, 34940), (630, 31446), (756, 26205), (810, 24458), (945, 20964), (1134, 17470), (1260, 15723), (1620, 12229), (1747, 11340), (1890, 10482), (2268, 8735), (2835, 6988), (3494, 5670), (3780, 5241)]