21181520

素因数分解:

$2^4\times 5^1\times {\mathrm{264769}}^1$

素因数の和:264782

約数の個数: 20

約数和(自身を含む): 49247220

約数和(自身を除く): 28065700

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264769, 529538, 1059076, 1323845, 2118152, 2647690, 4236304, 5295380, 10590760, 21181520]

約数ペア:

[(1, 21181520), (2, 10590760), (4, 5295380), (5, 4236304), (8, 2647690), (10, 2118152), (16, 1323845), (20, 1059076), (40, 529538), (80, 264769)]