21290841

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{233}}^1$

素因数の和:334

約数の個数: 48

約数和(自身を含む): 36796032

約数和(自身を除く): 15505191

約数列:

[1, 3, 9, 11, 13, 33, 39, 71, 99, 117, 143, 213, 233, 429, 639, 699, 781, 923, 1287, 2097, 2343, 2563, 2769, 3029, 7029, 7689, 8307, 9087, 10153, 16543, 23067, 27261, 30459, 33319, 49629, 91377, 99957, 148887, 181973, 215059, 299871, 545919, 645177, 1637757, 1935531, 2365649, 7096947, 21290841]

約数ペア:

[(1, 21290841), (3, 7096947), (9, 2365649), (11, 1935531), (13, 1637757), (33, 645177), (39, 545919), (71, 299871), (99, 215059), (117, 181973), (143, 148887), (213, 99957), (233, 91377), (429, 49629), (639, 33319), (699, 30459), (781, 27261), (923, 23067), (1287, 16543), (2097, 10153), (2343, 9087), (2563, 8307), (2769, 7689), (3029, 7029)]