21781520

素因数分解:

$2^4\times 5^1\times {\mathrm{272269}}^1$

素因数の和:272282

約数の個数: 20

約数和(自身を含む): 50642220

約数和(自身を除く): 28860700

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272269, 544538, 1089076, 1361345, 2178152, 2722690, 4356304, 5445380, 10890760, 21781520]

約数ペア:

[(1, 21781520), (2, 10890760), (4, 5445380), (5, 4356304), (8, 2722690), (10, 2178152), (16, 1361345), (20, 1089076), (40, 544538), (80, 272269)]