21807863

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{3989}}^1$

素因数の和:4078

約数の個数: 16

約数和(自身を含む): 27578880

約数和(自身を除く): 5771017

約数列:

[1, 7, 11, 71, 77, 497, 781, 3989, 5467, 27923, 43879, 283219, 307153, 1982533, 3115409, 21807863]

約数ペア:

[(1, 21807863), (7, 3115409), (11, 1982533), (71, 307153), (77, 283219), (497, 43879), (781, 27923), (3989, 5467)]