404000

素因数分解:

$2^5\times 5^3\times {\mathrm{101}}^1$

素因数の和:126

約数の個数: 48

約数和(自身を含む): 1002456

約数和(自身を除く): 598456

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 101, 125, 160, 200, 202, 250, 400, 404, 500, 505, 800, 808, 1000, 1010, 1616, 2000, 2020, 2525, 3232, 4000, 4040, 5050, 8080, 10100, 12625, 16160, 20200, 25250, 40400, 50500, 80800, 101000, 202000, 404000]

約数ペア:

[(1, 404000), (2, 202000), (4, 101000), (5, 80800), (8, 50500), (10, 40400), (16, 25250), (20, 20200), (25, 16160), (32, 12625), (40, 10100), (50, 8080), (80, 5050), (100, 4040), (101, 4000), (125, 3232), (160, 2525), (200, 2020), (202, 2000), (250, 1616), (400, 1010), (404, 1000), (500, 808), (505, 800)]