21123478

素因数分解:

$2^1\times {\mathrm{19}}^1\times {\mathrm{389}}^1\times {\mathrm{1429}}^1$

素因数の和:1839

約数の個数: 16

約数和(自身を含む): 33462000

約数和(自身を除く): 12338522

約数列:

[1, 2, 19, 38, 389, 778, 1429, 2858, 7391, 14782, 27151, 54302, 555881, 1111762, 10561739, 21123478]

約数ペア:

[(1, 21123478), (2, 10561739), (19, 1111762), (38, 555881), (389, 54302), (778, 27151), (1429, 14782), (2858, 7391)]