21780031

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{3371}}^1$

素因数の和:3462

約数の個数: 16

約数和(自身を含む): 27191808

約数和(自身を除く): 5411777

約数列:

[1, 7, 13, 71, 91, 497, 923, 3371, 6461, 23597, 43823, 239341, 306761, 1675387, 3111433, 21780031]

約数ペア:

[(1, 21780031), (7, 3111433), (13, 1675387), (71, 306761), (91, 239341), (497, 43823), (923, 23597), (3371, 6461)]