21281517

素因数分解:

$3^2\times {\mathrm{43}}^1\times {\mathrm{127}}^1\times {\mathrm{433}}^1$

素因数の和:609

約数の個数: 24

約数和(自身を含む): 31775744

約数和(自身を除く): 10494227

約数列:

[1, 3, 9, 43, 127, 129, 381, 387, 433, 1143, 1299, 3897, 5461, 16383, 18619, 49149, 54991, 55857, 164973, 167571, 494919, 2364613, 7093839, 21281517]

約数ペア:

[(1, 21281517), (3, 7093839), (9, 2364613), (43, 494919), (127, 167571), (129, 164973), (381, 55857), (387, 54991), (433, 49149), (1143, 18619), (1299, 16383), (3897, 5461)]