127967984

素因数分解:

$2^4\times {\mathrm{1999}}^1\times {\mathrm{4001}}^1$

素因数の和:6008

約数の個数: 20

約数和(自身を含む): 248124000

約数和(自身を除く): 120156016

約数列:

[1, 2, 4, 8, 16, 1999, 3998, 4001, 7996, 8002, 15992, 16004, 31984, 32008, 64016, 7997999, 15995998, 31991996, 63983992, 127967984]

約数ペア:

[(1, 127967984), (2, 63983992), (4, 31991996), (8, 15995998), (16, 7997999), (1999, 64016), (3998, 32008), (4001, 31984), (7996, 16004), (8002, 15992)]