405020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{263}}^1$

素因数の和:290

約数の個数: 48

約数和(自身を含む): 1064448

約数和(自身を除く): 659428

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 263, 308, 385, 526, 770, 1052, 1315, 1540, 1841, 2630, 2893, 3682, 5260, 5786, 7364, 9205, 11572, 14465, 18410, 20251, 28930, 36820, 40502, 57860, 81004, 101255, 202510, 405020]

約数ペア:

[(1, 405020), (2, 202510), (4, 101255), (5, 81004), (7, 57860), (10, 40502), (11, 36820), (14, 28930), (20, 20251), (22, 18410), (28, 14465), (35, 11572), (44, 9205), (55, 7364), (70, 5786), (77, 5260), (110, 3682), (140, 2893), (154, 2630), (220, 1841), (263, 1540), (308, 1315), (385, 1052), (526, 770)]