21388191

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{167}}^1\times {\mathrm{3881}}^1$

素因数の和:4062

約数の個数: 16

約数和(自身を含む): 31304448

約数和(自身を除く): 9916257

約数列:

[1, 3, 11, 33, 167, 501, 1837, 3881, 5511, 11643, 42691, 128073, 648127, 1944381, 7129397, 21388191]

約数ペア:

[(1, 21388191), (3, 7129397), (11, 1944381), (33, 648127), (167, 128073), (501, 42691), (1837, 11643), (3881, 5511)]