21257755

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{233}}^1\times {\mathrm{257}}^1$

素因数の和:566

約数の個数: 16

約数和(自身を含む): 26080704

約数和(自身を除く): 4822949

約数列:

[1, 5, 71, 233, 257, 355, 1165, 1285, 16543, 18247, 59881, 82715, 91235, 299405, 4251551, 21257755]

約数ペア:

[(1, 21257755), (5, 4251551), (71, 299405), (233, 91235), (257, 82715), (355, 59881), (1165, 18247), (1285, 16543)]