19988001

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{1999}}^1$

素因数の和:2117

約数の個数: 24

約数和(自身を含む): 31824000

約数和(自身を除く): 11835999

約数列:

[1, 3, 9, 11, 33, 99, 101, 303, 909, 1111, 1999, 3333, 5997, 9999, 17991, 21989, 65967, 197901, 201899, 605697, 1817091, 2220889, 6662667, 19988001]

約数ペア:

[(1, 19988001), (3, 6662667), (9, 2220889), (11, 1817091), (33, 605697), (99, 201899), (101, 197901), (303, 65967), (909, 21989), (1111, 17991), (1999, 9999), (3333, 5997)]