81289880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{73}}^1\times {\mathrm{97}}^1$

素因数の和:229

約数の個数: 128

約数和(自身を含む): 219300480

約数和(自身を除く): 138010600

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 41, 56, 70, 73, 82, 97, 140, 146, 164, 194, 205, 280, 287, 292, 328, 365, 388, 410, 485, 511, 574, 584, 679, 730, 776, 820, 970, 1022, 1148, 1358, 1435, 1460, 1640, 1940, 2044, 2296, 2555, 2716, 2870, 2920, 2993, 3395, 3880, 3977, 4088, 5110, 5432, 5740, 5986, 6790, 7081, 7954, 10220, 11480, 11972, 13580, 14162, 14965, 15908, 19885, 20440, 20951, 23944, 27160, 27839, 28324, 29930, 31816, 35405, 39770, 41902, 49567, 55678, 56648, 59860, 70810, 79540, 83804, 99134, 104755, 111356, 119720, 139195, 141620, 159080, 167608, 198268, 209510, 222712, 247835, 278390, 283240, 290321, 396536, 419020, 495670, 556780, 580642, 838040, 991340, 1113560, 1161284, 1451605, 1982680, 2032247, 2322568, 2903210, 4064494, 5806420, 8128988, 10161235, 11612840, 16257976, 20322470, 40644940, 81289880]

約数ペア:

[(1, 81289880), (2, 40644940), (4, 20322470), (5, 16257976), (7, 11612840), (8, 10161235), (10, 8128988), (14, 5806420), (20, 4064494), (28, 2903210), (35, 2322568), (40, 2032247), (41, 1982680), (56, 1451605), (70, 1161284), (73, 1113560), (82, 991340), (97, 838040), (140, 580642), (146, 556780), (164, 495670), (194, 419020), (205, 396536), (280, 290321), (287, 283240), (292, 278390), (328, 247835), (365, 222712), (388, 209510), (410, 198268), (485, 167608), (511, 159080), (574, 141620), (584, 139195), (679, 119720), (730, 111356), (776, 104755), (820, 99134), (970, 83804), (1022, 79540), (1148, 70810), (1358, 59860), (1435, 56648), (1460, 55678), (1640, 49567), (1940, 41902), (2044, 39770), (2296, 35405), (2555, 31816), (2716, 29930), (2870, 28324), (2920, 27839), (2993, 27160), (3395, 23944), (3880, 20951), (3977, 20440), (4088, 19885), (5110, 15908), (5432, 14965), (5740, 14162), (5986, 13580), (6790, 11972), (7081, 11480), (7954, 10220)]