81271720

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47251}}^1$

素因数の和:47305

約数の個数: 32

約数和(自身を含む): 187117920

約数和(自身を除く): 105846200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 47251, 94502, 189004, 236255, 378008, 472510, 945020, 1890040, 2031793, 4063586, 8127172, 10158965, 16254344, 20317930, 40635860, 81271720]

約数ペア:

[(1, 81271720), (2, 40635860), (4, 20317930), (5, 16254344), (8, 10158965), (10, 8127172), (20, 4063586), (40, 2031793), (43, 1890040), (86, 945020), (172, 472510), (215, 378008), (344, 236255), (430, 189004), (860, 94502), (1720, 47251)]