21155440

素因数分解:

$2^4\times 5^1\times {\mathrm{264443}}^1$

素因数の和:264456

約数の個数: 20

約数和(自身を含む): 49186584

約数和(自身を除く): 28031144

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264443, 528886, 1057772, 1322215, 2115544, 2644430, 4231088, 5288860, 10577720, 21155440]

約数ペア:

[(1, 21155440), (2, 10577720), (4, 5288860), (5, 4231088), (8, 2644430), (10, 2115544), (16, 1322215), (20, 1057772), (40, 528886), (80, 264443)]