21071271

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{409}}^1\times {\mathrm{1321}}^1$

素因数の和:1746

約数の個数: 16

約数和(自身を含む): 30353120

約数和(自身を除く): 9281849

約数列:

[1, 3, 13, 39, 409, 1227, 1321, 3963, 5317, 15951, 17173, 51519, 540289, 1620867, 7023757, 21071271]

約数ペア:

[(1, 21071271), (3, 7023757), (13, 1620867), (39, 540289), (409, 51519), (1227, 17173), (1321, 15951), (3963, 5317)]