21781136

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{104717}}^1$

素因数の和:104738

約数の個数: 20

約数和(自身を含む): 45447612

約数和(自身を除く): 23666476

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 104717, 209434, 418868, 837736, 1361321, 1675472, 2722642, 5445284, 10890568, 21781136]

約数ペア:

[(1, 21781136), (2, 10890568), (4, 5445284), (8, 2722642), (13, 1675472), (16, 1361321), (26, 837736), (52, 418868), (104, 209434), (208, 104717)]