21254915

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{5443}}^1$

素因数の和:5530

約数の個数: 16

約数和(自身を含む): 28221696

約数和(自身を除く): 6966781

約数列:

[1, 5, 11, 55, 71, 355, 781, 3905, 5443, 27215, 59873, 299365, 386453, 1932265, 4250983, 21254915]

約数ペア:

[(1, 21254915), (5, 4250983), (11, 1932265), (55, 386453), (71, 299365), (355, 59873), (781, 27215), (3905, 5443)]