20997431

素因数分解:

$7^3\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{277}}^1$

素因数の和:328

約数の個数: 32

約数和(自身を含む): 28022400

約数和(自身を除く): 7024969

約数列:

[1, 7, 13, 17, 49, 91, 119, 221, 277, 343, 637, 833, 1547, 1939, 3601, 4459, 4709, 5831, 10829, 13573, 25207, 32963, 61217, 75803, 95011, 176449, 230741, 428519, 1235143, 1615187, 2999633, 20997431]

約数ペア:

[(1, 20997431), (7, 2999633), (13, 1615187), (17, 1235143), (49, 428519), (91, 230741), (119, 176449), (221, 95011), (277, 75803), (343, 61217), (637, 32963), (833, 25207), (1547, 13573), (1939, 10829), (3601, 5831), (4459, 4709)]