661780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{163}}^1$

素因数の和:208

約数の個数: 48

約数和(自身を含む): 1653120

約数和(自身を除く): 991340

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 58, 70, 116, 140, 145, 163, 203, 290, 326, 406, 580, 652, 812, 815, 1015, 1141, 1630, 2030, 2282, 3260, 4060, 4564, 4727, 5705, 9454, 11410, 18908, 22820, 23635, 33089, 47270, 66178, 94540, 132356, 165445, 330890, 661780]

約数ペア:

[(1, 661780), (2, 330890), (4, 165445), (5, 132356), (7, 94540), (10, 66178), (14, 47270), (20, 33089), (28, 23635), (29, 22820), (35, 18908), (58, 11410), (70, 9454), (116, 5705), (140, 4727), (145, 4564), (163, 4060), (203, 3260), (290, 2282), (326, 2030), (406, 1630), (580, 1141), (652, 1015), (812, 815)]