21406217

素因数分解:

$7^1\times {\mathrm{19}}^2\times {\mathrm{43}}^1\times {\mathrm{197}}^1$

素因数の和:285

約数の個数: 24

約数和(自身を含む): 26554176

約数和(自身を除く): 5147959

約数列:

[1, 7, 19, 43, 133, 197, 301, 361, 817, 1379, 2527, 3743, 5719, 8471, 15523, 26201, 59297, 71117, 108661, 160949, 497819, 1126643, 3058031, 21406217]

約数ペア:

[(1, 21406217), (7, 3058031), (19, 1126643), (43, 497819), (133, 160949), (197, 108661), (301, 71117), (361, 59297), (817, 26201), (1379, 15523), (2527, 8471), (3743, 5719)]