21130109

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1$

素因数の和:162

約数の個数: 48

約数和(自身を含む): 30387840

約数和(自身を除く): 9257731

約数列:

[1, 7, 11, 13, 19, 77, 91, 101, 121, 133, 143, 209, 247, 707, 847, 1001, 1111, 1313, 1463, 1573, 1729, 1919, 2299, 2717, 7777, 9191, 11011, 12221, 13433, 14443, 16093, 19019, 21109, 24947, 29887, 85547, 101101, 147763, 158873, 174629, 209209, 232199, 274417, 1112111, 1625393, 1920919, 3018587, 21130109]

約数ペア:

[(1, 21130109), (7, 3018587), (11, 1920919), (13, 1625393), (19, 1112111), (77, 274417), (91, 232199), (101, 209209), (121, 174629), (133, 158873), (143, 147763), (209, 101101), (247, 85547), (707, 29887), (847, 24947), (1001, 21109), (1111, 19019), (1313, 16093), (1463, 14443), (1573, 13433), (1729, 12221), (1919, 11011), (2299, 9191), (2717, 7777)]