20521480

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{73291}}^1$

素因数の和:73309

約数の個数: 32

約数和(自身を含む): 52770240

約数和(自身を除く): 32248760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 73291, 146582, 293164, 366455, 513037, 586328, 732910, 1026074, 1465820, 2052148, 2565185, 2931640, 4104296, 5130370, 10260740, 20521480]

約数ペア:

[(1, 20521480), (2, 10260740), (4, 5130370), (5, 4104296), (7, 2931640), (8, 2565185), (10, 2052148), (14, 1465820), (20, 1026074), (28, 732910), (35, 586328), (40, 513037), (56, 366455), (70, 293164), (140, 146582), (280, 73291)]