405820

素因数分解:

$2^2\times 5^1\times {\mathrm{103}}^1\times {\mathrm{197}}^1$

素因数の和:309

約数の個数: 24

約数和(自身を含む): 864864

約数和(自身を除く): 459044

約数列:

[1, 2, 4, 5, 10, 20, 103, 197, 206, 394, 412, 515, 788, 985, 1030, 1970, 2060, 3940, 20291, 40582, 81164, 101455, 202910, 405820]

約数ペア:

[(1, 405820), (2, 202910), (4, 101455), (5, 81164), (10, 40582), (20, 20291), (103, 3940), (197, 2060), (206, 1970), (394, 1030), (412, 985), (515, 788)]