21781264

素因数分解:

$2^4\times {\mathrm{257}}^1\times {\mathrm{5297}}^1$

素因数の和:5562

約数の個数: 20

約数和(自身を含む): 42373404

約数和(自身を除く): 20592140

約数列:

[1, 2, 4, 8, 16, 257, 514, 1028, 2056, 4112, 5297, 10594, 21188, 42376, 84752, 1361329, 2722658, 5445316, 10890632, 21781264]

約数ペア:

[(1, 21781264), (2, 10890632), (4, 5445316), (8, 2722658), (16, 1361329), (257, 84752), (514, 42376), (1028, 21188), (2056, 10594), (4112, 5297)]