21372247

素因数分解:

${\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{173}}^1$

素因数の和:259

約数の個数: 24

約数和(自身を含む): 25218864

約数和(自身を除く): 3846617

約数列:

[1, 13, 17, 43, 169, 173, 221, 559, 731, 2249, 2873, 2941, 7267, 7439, 9503, 29237, 38233, 96707, 123539, 126463, 497029, 1257191, 1644019, 21372247]

約数ペア:

[(1, 21372247), (13, 1644019), (17, 1257191), (43, 497029), (169, 126463), (173, 123539), (221, 96707), (559, 38233), (731, 29237), (2249, 9503), (2873, 7439), (2941, 7267)]