21013605

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{79}}^1\times {\mathrm{257}}^1$

素因数の和:370

約数の個数: 48

約数和(自身を含む): 38638080

約数和(自身を除く): 17624475

約数列:

[1, 3, 5, 9, 15, 23, 45, 69, 79, 115, 207, 237, 257, 345, 395, 711, 771, 1035, 1185, 1285, 1817, 2313, 3555, 3855, 5451, 5911, 9085, 11565, 16353, 17733, 20303, 27255, 29555, 53199, 60909, 81765, 88665, 101515, 182727, 265995, 304545, 466969, 913635, 1400907, 2334845, 4202721, 7004535, 21013605]

約数ペア:

[(1, 21013605), (3, 7004535), (5, 4202721), (9, 2334845), (15, 1400907), (23, 913635), (45, 466969), (69, 304545), (79, 265995), (115, 182727), (207, 101515), (237, 88665), (257, 81765), (345, 60909), (395, 53199), (711, 29555), (771, 27255), (1035, 20303), (1185, 17733), (1285, 16353), (1817, 11565), (2313, 9085), (3555, 5911), (3855, 5451)]