20721987

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{1789}}^1$

素因数の和:1825

約数の個数: 40

約数和(自身を含む): 36387120

約数和(自身を除く): 15665133

約数列:

[1, 3, 9, 11, 13, 27, 33, 39, 81, 99, 117, 143, 297, 351, 429, 891, 1053, 1287, 1789, 3861, 5367, 11583, 16101, 19679, 23257, 48303, 59037, 69771, 144909, 177111, 209313, 255827, 531333, 627939, 767481, 1593999, 1883817, 2302443, 6907329, 20721987]

約数ペア:

[(1, 20721987), (3, 6907329), (9, 2302443), (11, 1883817), (13, 1593999), (27, 767481), (33, 627939), (39, 531333), (81, 255827), (99, 209313), (117, 177111), (143, 144909), (297, 69771), (351, 59037), (429, 48303), (891, 23257), (1053, 19679), (1287, 16101), (1789, 11583), (3861, 5367)]