21409515

素因数分解:

$3^5\times 5^1\times {\mathrm{67}}^1\times {\mathrm{263}}^1$

素因数の和:350

約数の個数: 48

約数和(自身を含む): 39207168

約数和(自身を除く): 17797653

約数列:

[1, 3, 5, 9, 15, 27, 45, 67, 81, 135, 201, 243, 263, 335, 405, 603, 789, 1005, 1215, 1315, 1809, 2367, 3015, 3945, 5427, 7101, 9045, 11835, 16281, 17621, 21303, 27135, 35505, 52863, 63909, 81405, 88105, 106515, 158589, 264315, 319545, 475767, 792945, 1427301, 2378835, 4281903, 7136505, 21409515]

約数ペア:

[(1, 21409515), (3, 7136505), (5, 4281903), (9, 2378835), (15, 1427301), (27, 792945), (45, 475767), (67, 319545), (81, 264315), (135, 158589), (201, 106515), (243, 88105), (263, 81405), (335, 63909), (405, 52863), (603, 35505), (789, 27135), (1005, 21303), (1215, 17621), (1315, 16281), (1809, 11835), (2367, 9045), (3015, 7101), (3945, 5427)]