28112721

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{313}}^1$

素因数の和:390

約数の個数: 48

約数和(自身を含む): 48109824

約数和(自身を除く): 19997103

約数列:

[1, 3, 7, 13, 21, 39, 47, 49, 91, 141, 147, 273, 313, 329, 611, 637, 939, 987, 1833, 1911, 2191, 2303, 4069, 4277, 6573, 6909, 12207, 12831, 14711, 15337, 28483, 29939, 44133, 46011, 85449, 89817, 102977, 191243, 199381, 308931, 573729, 598143, 720839, 1338701, 2162517, 4016103, 9370907, 28112721]

約数ペア:

[(1, 28112721), (3, 9370907), (7, 4016103), (13, 2162517), (21, 1338701), (39, 720839), (47, 598143), (49, 573729), (91, 308931), (141, 199381), (147, 191243), (273, 102977), (313, 89817), (329, 85449), (611, 46011), (637, 44133), (939, 29939), (987, 28483), (1833, 15337), (1911, 14711), (2191, 12831), (2303, 12207), (4069, 6909), (4277, 6573)]