21811517

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{353}}^1$

素因数の和:477

約数の個数: 24

約数和(自身を含む): 27684216

約数和(自身を除く): 5872699

約数列:

[1, 7, 13, 49, 91, 97, 353, 637, 679, 1261, 2471, 4589, 4753, 8827, 17297, 32123, 34241, 61789, 224861, 239687, 445133, 1677809, 3115931, 21811517]

約数ペア:

[(1, 21811517), (7, 3115931), (13, 1677809), (49, 445133), (91, 239687), (97, 224861), (353, 61789), (637, 34241), (679, 32123), (1261, 17297), (2471, 8827), (4589, 4753)]