21781468

素因数分解:

$2^2\times {\mathrm{31}}^1\times {\mathrm{269}}^1\times {\mathrm{653}}^1$

素因数の和:957

約数の個数: 24

約数和(自身を含む): 39553920

約数和(自身を除く): 17772452

約数列:

[1, 2, 4, 31, 62, 124, 269, 538, 653, 1076, 1306, 2612, 8339, 16678, 20243, 33356, 40486, 80972, 175657, 351314, 702628, 5445367, 10890734, 21781468]

約数ペア:

[(1, 21781468), (2, 10890734), (4, 5445367), (31, 702628), (62, 351314), (124, 175657), (269, 80972), (538, 40486), (653, 33356), (1076, 20243), (1306, 16678), (2612, 8339)]