20891487

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{59}}^1\times {\mathrm{131}}^1$

素因数の和:263

約数の個数: 32

約数和(自身を含む): 30792960

約数和(自身を除く): 9901473

約数列:

[1, 3, 17, 51, 53, 59, 131, 159, 177, 393, 901, 1003, 2227, 2703, 3009, 3127, 6681, 6943, 7729, 9381, 20829, 23187, 53159, 118031, 131393, 159477, 354093, 394179, 409637, 1228911, 6963829, 20891487]

約数ペア:

[(1, 20891487), (3, 6963829), (17, 1228911), (51, 409637), (53, 394179), (59, 354093), (131, 159477), (159, 131393), (177, 118031), (393, 53159), (901, 23187), (1003, 20829), (2227, 9381), (2703, 7729), (3009, 6943), (3127, 6681)]