640160

素因数分解:

$2^5\times 5^1\times {\mathrm{4001}}^1$

素因数の和:4016

約数の個数: 24

約数和(自身を含む): 1512756

約数和(自身を除く): 872596

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 4001, 8002, 16004, 20005, 32008, 40010, 64016, 80020, 128032, 160040, 320080, 640160]

約数ペア:

[(1, 640160), (2, 320080), (4, 160040), (5, 128032), (8, 80020), (10, 64016), (16, 40010), (20, 32008), (32, 20005), (40, 16004), (80, 8002), (160, 4001)]