20664639

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{349}}^1$

素因数の和:421

約数の個数: 40

約数和(自身を含む): 33541200

約数和(自身を除く): 12876561

約数列:

[1, 3, 9, 17, 27, 43, 51, 81, 129, 153, 349, 387, 459, 731, 1047, 1161, 1377, 2193, 3141, 3483, 5933, 6579, 9423, 15007, 17799, 19737, 28269, 45021, 53397, 59211, 135063, 160191, 255119, 405189, 480573, 765357, 1215567, 2296071, 6888213, 20664639]

約数ペア:

[(1, 20664639), (3, 6888213), (9, 2296071), (17, 1215567), (27, 765357), (43, 480573), (51, 405189), (81, 255119), (129, 160191), (153, 135063), (349, 59211), (387, 53397), (459, 45021), (731, 28269), (1047, 19737), (1161, 17799), (1377, 15007), (2193, 9423), (3141, 6579), (3483, 5933)]