21306640

素因数分解:

$2^4\times 5^1\times {\mathrm{266333}}^1$

素因数の和:266346

約数の個数: 20

約数和(自身を含む): 49538124

約数和(自身を除く): 28231484

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266333, 532666, 1065332, 1331665, 2130664, 2663330, 4261328, 5326660, 10653320, 21306640]

約数ペア:

[(1, 21306640), (2, 10653320), (4, 5326660), (5, 4261328), (8, 2663330), (10, 2130664), (16, 1331665), (20, 1065332), (40, 532666), (80, 266333)]