19910900

素因数分解:

$2^2\times 5^2\times {\mathrm{199109}}^1$

素因数の和:199123

約数の個数: 18

約数和(自身を含む): 43206870

約数和(自身を除く): 23295970

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 199109, 398218, 796436, 995545, 1991090, 3982180, 4977725, 9955450, 19910900]

約数ペア:

[(1, 19910900), (2, 9955450), (4, 4977725), (5, 3982180), (10, 1991090), (20, 995545), (25, 796436), (50, 398218), (100, 199109)]