81620721

素因数分解:

$3^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{619}}^1$

素因数の和:675

約数の個数: 72

約数和(自身を含む): 154365120

約数和(自身を除く): 72744399

約数列:

[1, 3, 7, 9, 13, 21, 23, 39, 49, 63, 69, 91, 117, 147, 161, 207, 273, 299, 441, 483, 619, 637, 819, 897, 1127, 1449, 1857, 1911, 2093, 2691, 3381, 4333, 5571, 5733, 6279, 8047, 10143, 12999, 14237, 14651, 18837, 24141, 30331, 38997, 42711, 43953, 56329, 72423, 90993, 99659, 128133, 131859, 168987, 185081, 272979, 298977, 394303, 506961, 555243, 697613, 896931, 1182909, 1295567, 1665729, 2092839, 3548727, 3886701, 6278517, 9068969, 11660103, 27206907, 81620721]

約数ペア:

[(1, 81620721), (3, 27206907), (7, 11660103), (9, 9068969), (13, 6278517), (21, 3886701), (23, 3548727), (39, 2092839), (49, 1665729), (63, 1295567), (69, 1182909), (91, 896931), (117, 697613), (147, 555243), (161, 506961), (207, 394303), (273, 298977), (299, 272979), (441, 185081), (483, 168987), (619, 131859), (637, 128133), (819, 99659), (897, 90993), (1127, 72423), (1449, 56329), (1857, 43953), (1911, 42711), (2093, 38997), (2691, 30331), (3381, 24141), (4333, 18837), (5571, 14651), (5733, 14237), (6279, 12999), (8047, 10143)]