81581240

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{156887}}^1$

素因数の和:156911

約数の個数: 32

約数和(自身を含む): 197678880

約数和(自身を除く): 116097640

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 156887, 313774, 627548, 784435, 1255096, 1568870, 2039531, 3137740, 4079062, 6275480, 8158124, 10197655, 16316248, 20395310, 40790620, 81581240]

約数ペア:

[(1, 81581240), (2, 40790620), (4, 20395310), (5, 16316248), (8, 10197655), (10, 8158124), (13, 6275480), (20, 4079062), (26, 3137740), (40, 2039531), (52, 1568870), (65, 1255096), (104, 784435), (130, 627548), (260, 313774), (520, 156887)]