20396440

素因数分解:

$2^3\times 5^1\times {\mathrm{509911}}^1$

素因数の和:509922

約数の個数: 16

約数和(自身を含む): 45892080

約数和(自身を除く): 25495640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509911, 1019822, 2039644, 2549555, 4079288, 5099110, 10198220, 20396440]

約数ペア:

[(1, 20396440), (2, 10198220), (4, 5099110), (5, 4079288), (8, 2549555), (10, 2039644), (20, 1019822), (40, 509911)]