21051639

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{409}}^1$

素因数の和:484

約数の個数: 48

約数和(自身を含む): 37523200

約数和(自身を除く): 16471561

約数列:

[1, 3, 7, 9, 19, 21, 43, 57, 63, 129, 133, 171, 301, 387, 399, 409, 817, 903, 1197, 1227, 2451, 2709, 2863, 3681, 5719, 7353, 7771, 8589, 17157, 17587, 23313, 25767, 51471, 52761, 54397, 69939, 123109, 158283, 163191, 334153, 369327, 489573, 1002459, 1107981, 2339071, 3007377, 7017213, 21051639]

約数ペア:

[(1, 21051639), (3, 7017213), (7, 3007377), (9, 2339071), (19, 1107981), (21, 1002459), (43, 489573), (57, 369327), (63, 334153), (129, 163191), (133, 158283), (171, 123109), (301, 69939), (387, 54397), (399, 52761), (409, 51471), (817, 25767), (903, 23313), (1197, 17587), (1227, 17157), (2451, 8589), (2709, 7771), (2863, 7353), (3681, 5719)]