257355

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1$

素因数の和:80

約数の個数: 48

約数和(自身を含む): 549120

約数和(自身を除く): 291765

約数列:

[1, 3, 5, 7, 9, 15, 19, 21, 35, 43, 45, 57, 63, 95, 105, 129, 133, 171, 215, 285, 301, 315, 387, 399, 645, 665, 817, 855, 903, 1197, 1505, 1935, 1995, 2451, 2709, 4085, 4515, 5719, 5985, 7353, 12255, 13545, 17157, 28595, 36765, 51471, 85785, 257355]

約数ペア:

[(1, 257355), (3, 85785), (5, 51471), (7, 36765), (9, 28595), (15, 17157), (19, 13545), (21, 12255), (35, 7353), (43, 5985), (45, 5719), (57, 4515), (63, 4085), (95, 2709), (105, 2451), (129, 1995), (133, 1935), (171, 1505), (215, 1197), (285, 903), (301, 855), (315, 817), (387, 665), (399, 645)]