21509973

素因数分解:

$3^2\times {\mathrm{47}}^1\times {\mathrm{211}}^1\times {\mathrm{241}}^1$

素因数の和:505

約数の個数: 24

約数和(自身を含む): 32013696

約数和(自身を除く): 10503723

約数列:

[1, 3, 9, 47, 141, 211, 241, 423, 633, 723, 1899, 2169, 9917, 11327, 29751, 33981, 50851, 89253, 101943, 152553, 457659, 2389997, 7169991, 21509973]

約数ペア:

[(1, 21509973), (3, 7169991), (9, 2389997), (47, 457659), (141, 152553), (211, 101943), (241, 89253), (423, 50851), (633, 33981), (723, 29751), (1899, 11327), (2169, 9917)]