20971557

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{113}}^1\times {\mathrm{1213}}^1$

素因数の和:1349

約数の個数: 24

約数和(自身を含む): 32384664

約数和(自身を除く): 11413107

約数列:

[1, 3, 9, 17, 51, 113, 153, 339, 1017, 1213, 1921, 3639, 5763, 10917, 17289, 20621, 61863, 137069, 185589, 411207, 1233621, 2330173, 6990519, 20971557]

約数ペア:

[(1, 20971557), (3, 6990519), (9, 2330173), (17, 1233621), (51, 411207), (113, 185589), (153, 137069), (339, 61863), (1017, 20621), (1213, 17289), (1921, 10917), (3639, 5763)]