21156772

素因数分解:

$2^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{263}}^1$

素因数の和:317

約数の個数: 72

約数和(自身を含む): 48698496

約数和(自身を除く): 27541724

約数列:

[1, 2, 4, 7, 13, 14, 17, 26, 28, 34, 52, 68, 91, 119, 169, 182, 221, 238, 263, 338, 364, 442, 476, 526, 676, 884, 1052, 1183, 1547, 1841, 2366, 2873, 3094, 3419, 3682, 4471, 4732, 5746, 6188, 6838, 7364, 8942, 11492, 13676, 17884, 20111, 23933, 31297, 40222, 44447, 47866, 58123, 62594, 80444, 88894, 95732, 116246, 125188, 177788, 232492, 311129, 406861, 622258, 755599, 813722, 1244516, 1511198, 1627444, 3022396, 5289193, 10578386, 21156772]

約数ペア:

[(1, 21156772), (2, 10578386), (4, 5289193), (7, 3022396), (13, 1627444), (14, 1511198), (17, 1244516), (26, 813722), (28, 755599), (34, 622258), (52, 406861), (68, 311129), (91, 232492), (119, 177788), (169, 125188), (182, 116246), (221, 95732), (238, 88894), (263, 80444), (338, 62594), (364, 58123), (442, 47866), (476, 44447), (526, 40222), (676, 31297), (884, 23933), (1052, 20111), (1183, 17884), (1547, 13676), (1841, 11492), (2366, 8942), (2873, 7364), (3094, 6838), (3419, 6188), (3682, 5746), (4471, 4732)]