19809999

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{18191}}^1$

素因数の和:18219

約数の個数: 18

約数和(自身を含む): 31453968

約数和(自身を除く): 11643969

約数列:

[1, 3, 9, 11, 33, 99, 121, 363, 1089, 18191, 54573, 163719, 200101, 600303, 1800909, 2201111, 6603333, 19809999]

約数ペア:

[(1, 19809999), (3, 6603333), (9, 2201111), (11, 1800909), (33, 600303), (99, 200101), (121, 163719), (363, 54573), (1089, 18191)]