21011535

素因数分解:

$3^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{67}}^1\times {\mathrm{101}}^1$

素因数の和:205

約数の個数: 64

約数和(自身を含む): 39951360

約数和(自身を除く): 18939825

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 67, 69, 101, 115, 135, 201, 207, 303, 335, 345, 505, 603, 621, 909, 1005, 1035, 1515, 1541, 1809, 2323, 2727, 3015, 3105, 4545, 4623, 6767, 6969, 7705, 9045, 11615, 13635, 13869, 20301, 20907, 23115, 33835, 34845, 41607, 60903, 62721, 69345, 101505, 104535, 155641, 182709, 208035, 304515, 313605, 466923, 778205, 913545, 1400769, 2334615, 4202307, 7003845, 21011535]

約数ペア:

[(1, 21011535), (3, 7003845), (5, 4202307), (9, 2334615), (15, 1400769), (23, 913545), (27, 778205), (45, 466923), (67, 313605), (69, 304515), (101, 208035), (115, 182709), (135, 155641), (201, 104535), (207, 101505), (303, 69345), (335, 62721), (345, 60903), (505, 41607), (603, 34845), (621, 33835), (909, 23115), (1005, 20907), (1035, 20301), (1515, 13869), (1541, 13635), (1809, 11615), (2323, 9045), (2727, 7705), (3015, 6969), (3105, 6767), (4545, 4623)]