21271707

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{107}}^1\times {\mathrm{199}}^1$

素因数の和:352

約数の個数: 32

約数和(自身を含む): 32832000

約数和(自身を除く): 11560293

約数列:

[1, 3, 9, 27, 37, 107, 111, 199, 321, 333, 597, 963, 999, 1791, 2889, 3959, 5373, 7363, 11877, 21293, 22089, 35631, 63879, 66267, 106893, 191637, 198801, 574911, 787841, 2363523, 7090569, 21271707]

約数ペア:

[(1, 21271707), (3, 7090569), (9, 2363523), (27, 787841), (37, 574911), (107, 198801), (111, 191637), (199, 106893), (321, 66267), (333, 63879), (597, 35631), (963, 22089), (999, 21293), (1791, 11877), (2889, 7363), (3959, 5373)]