20654380

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{149}}^1\times {\mathrm{239}}^1$

素因数の和:426

約数の個数: 48

約数和(自身を含む): 45360000

約数和(自身を除く): 24705620

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 149, 239, 290, 298, 478, 580, 596, 745, 956, 1195, 1490, 2390, 2980, 4321, 4780, 6931, 8642, 13862, 17284, 21605, 27724, 34655, 35611, 43210, 69310, 71222, 86420, 138620, 142444, 178055, 356110, 712220, 1032719, 2065438, 4130876, 5163595, 10327190, 20654380]

約数ペア:

[(1, 20654380), (2, 10327190), (4, 5163595), (5, 4130876), (10, 2065438), (20, 1032719), (29, 712220), (58, 356110), (116, 178055), (145, 142444), (149, 138620), (239, 86420), (290, 71222), (298, 69310), (478, 43210), (580, 35611), (596, 34655), (745, 27724), (956, 21605), (1195, 17284), (1490, 13862), (2390, 8642), (2980, 6931), (4321, 4780)]