21132009

素因数分解:

$3^5\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{199}}^1$

素因数の和:256

約数の個数: 48

約数和(自身を含む): 34944000

約数和(自身を除く): 13811991

約数列:

[1, 3, 9, 19, 23, 27, 57, 69, 81, 171, 199, 207, 243, 437, 513, 597, 621, 1311, 1539, 1791, 1863, 3781, 3933, 4577, 4617, 5373, 5589, 11343, 11799, 13731, 16119, 34029, 35397, 41193, 48357, 86963, 102087, 106191, 123579, 260889, 306261, 370737, 782667, 918783, 1112211, 2348001, 7044003, 21132009]

約数ペア:

[(1, 21132009), (3, 7044003), (9, 2348001), (19, 1112211), (23, 918783), (27, 782667), (57, 370737), (69, 306261), (81, 260889), (171, 123579), (199, 106191), (207, 102087), (243, 86963), (437, 48357), (513, 41193), (597, 35397), (621, 34029), (1311, 16119), (1539, 13731), (1791, 11799), (1863, 11343), (3781, 5589), (3933, 5373), (4577, 4617)]