405400

素因数分解:

$2^3\times 5^2\times {\mathrm{2027}}^1$

素因数の和:2043

約数の個数: 24

約数和(自身を含む): 943020

約数和(自身を除く): 537620

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 2027, 4054, 8108, 10135, 16216, 20270, 40540, 50675, 81080, 101350, 202700, 405400]

約数ペア:

[(1, 405400), (2, 202700), (4, 101350), (5, 81080), (8, 50675), (10, 40540), (20, 20270), (25, 16216), (40, 10135), (50, 8108), (100, 4054), (200, 2027)]