19745901

素因数分解:

$3^2\times 7^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{197}}^1$

素因数の和:290

約数の個数: 48

約数和(自身を含む): 34429824

約数和(自身を除く): 14683923

約数列:

[1, 3, 7, 9, 21, 37, 43, 63, 111, 129, 197, 259, 301, 333, 387, 591, 777, 903, 1379, 1591, 1773, 2331, 2709, 4137, 4773, 7289, 8471, 11137, 12411, 14319, 21867, 25413, 33411, 51023, 59297, 65601, 76239, 100233, 153069, 177891, 313427, 459207, 533673, 940281, 2193989, 2820843, 6581967, 19745901]

約数ペア:

[(1, 19745901), (3, 6581967), (7, 2820843), (9, 2193989), (21, 940281), (37, 533673), (43, 459207), (63, 313427), (111, 177891), (129, 153069), (197, 100233), (259, 76239), (301, 65601), (333, 59297), (387, 51023), (591, 33411), (777, 25413), (903, 21867), (1379, 14319), (1591, 12411), (1773, 11137), (2331, 8471), (2709, 7289), (4137, 4773)]