21456379

素因数分解:

$7^1\times {\mathrm{73}}^1\times {\mathrm{199}}^1\times {\mathrm{211}}^1$

素因数の和:490

約数の個数: 16

約数和(自身を含む): 25100800

約数和(自身を除く): 3644421

約数列:

[1, 7, 73, 199, 211, 511, 1393, 1477, 14527, 15403, 41989, 101689, 107821, 293923, 3065197, 21456379]

約数ペア:

[(1, 21456379), (7, 3065197), (73, 293923), (199, 107821), (211, 101689), (511, 41989), (1393, 15403), (1477, 14527)]