19908009

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{101}}^1\times {\mathrm{181}}^1$

素因数の和:310

約数の個数: 36

約数和(自身を含む): 32097156

約数和(自身を除く): 12189147

約数列:

[1, 3, 9, 11, 33, 99, 101, 121, 181, 303, 363, 543, 909, 1089, 1111, 1629, 1991, 3333, 5973, 9999, 12221, 17919, 18281, 21901, 36663, 54843, 65703, 109989, 164529, 197109, 201091, 603273, 1809819, 2212001, 6636003, 19908009]

約数ペア:

[(1, 19908009), (3, 6636003), (9, 2212001), (11, 1809819), (33, 603273), (99, 201091), (101, 197109), (121, 164529), (181, 109989), (303, 65703), (363, 54843), (543, 36663), (909, 21901), (1089, 18281), (1111, 17919), (1629, 12221), (1991, 9999), (3333, 5973)]