19998783

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{263}}^1$

素因数の和:364

約数の個数: 48

約数和(自身を含む): 35582976

約数和(自身を除く): 15584193

約数列:

[1, 3, 7, 9, 17, 21, 51, 63, 71, 119, 153, 213, 263, 357, 497, 639, 789, 1071, 1207, 1491, 1841, 2367, 3621, 4471, 4473, 5523, 8449, 10863, 13413, 16569, 18673, 25347, 31297, 40239, 56019, 76041, 93891, 130711, 168057, 281673, 317441, 392133, 952323, 1176399, 2222087, 2856969, 6666261, 19998783]

約数ペア:

[(1, 19998783), (3, 6666261), (7, 2856969), (9, 2222087), (17, 1176399), (21, 952323), (51, 392133), (63, 317441), (71, 281673), (119, 168057), (153, 130711), (213, 93891), (263, 76041), (357, 56019), (497, 40239), (639, 31297), (789, 25347), (1071, 18673), (1207, 16569), (1491, 13413), (1841, 10863), (2367, 8449), (3621, 5523), (4471, 4473)]