21189680

素因数分解:

$2^4\times 5^1\times {\mathrm{264871}}^1$

素因数の和:264884

約数の個数: 20

約数和(自身を含む): 49266192

約数和(自身を除く): 28076512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264871, 529742, 1059484, 1324355, 2118968, 2648710, 4237936, 5297420, 10594840, 21189680]

約数ペア:

[(1, 21189680), (2, 10594840), (4, 5297420), (5, 4237936), (8, 2648710), (10, 2118968), (16, 1324355), (20, 1059484), (40, 529742), (80, 264871)]