21668517

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{59}}^1\times {\mathrm{73}}^1$

素因数の和:194

約数の個数: 48

約数和(自身を含む): 35555520

約数和(自身を除く): 13887003

約数列:

[1, 3, 9, 13, 39, 43, 59, 73, 117, 129, 177, 219, 387, 531, 559, 657, 767, 949, 1677, 2301, 2537, 2847, 3139, 4307, 5031, 6903, 7611, 8541, 9417, 12921, 22833, 28251, 32981, 38763, 40807, 55991, 98943, 122421, 167973, 185201, 296829, 367263, 503919, 555603, 1666809, 2407613, 7222839, 21668517]

約数ペア:

[(1, 21668517), (3, 7222839), (9, 2407613), (13, 1666809), (39, 555603), (43, 503919), (59, 367263), (73, 296829), (117, 185201), (129, 167973), (177, 122421), (219, 98943), (387, 55991), (531, 40807), (559, 38763), (657, 32981), (767, 28251), (949, 22833), (1677, 12921), (2301, 9417), (2537, 8541), (2847, 7611), (3139, 6903), (4307, 5031)]