21478527

素因数分解:

$3^7\times 7^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1$

素因数の和:112

約数の個数: 64

約数和(自身を含む): 39045120

約数和(自身を除く): 17566593

約数列:

[1, 3, 7, 9, 21, 23, 27, 61, 63, 69, 81, 161, 183, 189, 207, 243, 427, 483, 549, 567, 621, 729, 1281, 1403, 1449, 1647, 1701, 1863, 2187, 3843, 4209, 4347, 4941, 5103, 5589, 9821, 11529, 12627, 13041, 14823, 15309, 16767, 29463, 34587, 37881, 39123, 44469, 50301, 88389, 103761, 113643, 117369, 133407, 265167, 311283, 340929, 352107, 795501, 933849, 1022787, 2386503, 3068361, 7159509, 21478527]

約数ペア:

[(1, 21478527), (3, 7159509), (7, 3068361), (9, 2386503), (21, 1022787), (23, 933849), (27, 795501), (61, 352107), (63, 340929), (69, 311283), (81, 265167), (161, 133407), (183, 117369), (189, 113643), (207, 103761), (243, 88389), (427, 50301), (483, 44469), (549, 39123), (567, 37881), (621, 34587), (729, 29463), (1281, 16767), (1403, 15309), (1449, 14823), (1647, 13041), (1701, 12627), (1863, 11529), (2187, 9821), (3843, 5589), (4209, 5103), (4347, 4941)]