399920008

素因数分解:

$2^3\times {\mathrm{389}}^1\times {\mathrm{128509}}^1$

素因数の和:128904

約数の個数: 16

約数和(自身を含む): 751783500

約数和(自身を除く): 351863492

約数列:

[1, 2, 4, 8, 389, 778, 1556, 3112, 128509, 257018, 514036, 1028072, 49990001, 99980002, 199960004, 399920008]

約数ペア:

[(1, 399920008), (2, 199960004), (4, 99980002), (8, 49990001), (389, 1028072), (778, 514036), (1556, 257018), (3112, 128509)]