81679760

素因数分解:

$2^4\times 5^1\times {\mathrm{1020997}}^1$

素因数の和:1021010

約数の個数: 20

約数和(自身を含む): 189905628

約数和(自身を除く): 108225868

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1020997, 2041994, 4083988, 5104985, 8167976, 10209970, 16335952, 20419940, 40839880, 81679760]

約数ペア:

[(1, 81679760), (2, 40839880), (4, 20419940), (5, 16335952), (8, 10209970), (10, 8167976), (16, 5104985), (20, 4083988), (40, 2041994), (80, 1020997)]