20987271

素因数分解:

$3^2\times {\mathrm{29}}^1\times {\mathrm{191}}^1\times {\mathrm{421}}^1$

素因数の和:647

約数の個数: 24

約数和(自身を含む): 31599360

約数和(自身を除く): 10612089

約数列:

[1, 3, 9, 29, 87, 191, 261, 421, 573, 1263, 1719, 3789, 5539, 12209, 16617, 36627, 49851, 80411, 109881, 241233, 723699, 2331919, 6995757, 20987271]

約数ペア:

[(1, 20987271), (3, 6995757), (9, 2331919), (29, 723699), (87, 241233), (191, 109881), (261, 80411), (421, 49851), (573, 36627), (1263, 16617), (1719, 12209), (3789, 5539)]