21391167

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{23689}}^1$

素因数の和:23742

約数の個数: 16

約数和(自身を含む): 33355520

約数和(自身を除く): 11964353

約数列:

[1, 3, 7, 21, 43, 129, 301, 903, 23689, 71067, 165823, 497469, 1018627, 3055881, 7130389, 21391167]

約数ペア:

[(1, 21391167), (3, 7130389), (7, 3055881), (21, 1018627), (43, 497469), (129, 165823), (301, 71067), (903, 23689)]