21297740

素因数分解:

$2^2\times 5^1\times {\mathrm{263}}^1\times {\mathrm{4049}}^1$

素因数の和:4321

約数の個数: 24

約数和(自身を含む): 44906400

約数和(自身を除く): 23608660

約数列:

[1, 2, 4, 5, 10, 20, 263, 526, 1052, 1315, 2630, 4049, 5260, 8098, 16196, 20245, 40490, 80980, 1064887, 2129774, 4259548, 5324435, 10648870, 21297740]

約数ペア:

[(1, 21297740), (2, 10648870), (4, 5324435), (5, 4259548), (10, 2129774), (20, 1064887), (263, 80980), (526, 40490), (1052, 20245), (1315, 16196), (2630, 8098), (4049, 5260)]