21940720

素因数分解:

$2^4\times 5^1\times {\mathrm{274259}}^1$

素因数の和:274272

約数の個数: 20

約数和(自身を含む): 51012360

約数和(自身を除く): 29071640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 274259, 548518, 1097036, 1371295, 2194072, 2742590, 4388144, 5485180, 10970360, 21940720]

約数ペア:

[(1, 21940720), (2, 10970360), (4, 5485180), (5, 4388144), (8, 2742590), (10, 2194072), (16, 1371295), (20, 1097036), (40, 548518), (80, 274259)]