20881809

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{13729}}^1$

素因数の和:13761

約数の個数: 18

約数和(自身を含む): 32663670

約数和(自身を除く): 11781861

約数列:

[1, 3, 9, 13, 39, 117, 169, 507, 1521, 13729, 41187, 123561, 178477, 535431, 1606293, 2320201, 6960603, 20881809]

約数ペア:

[(1, 20881809), (3, 6960603), (9, 2320201), (13, 1606293), (39, 535431), (117, 178477), (169, 123561), (507, 41187), (1521, 13729)]