20939391

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{331}}^1$

素因数の和:425

約数の個数: 40

約数和(自身を含む): 34708608

約数和(自身を除く): 13769217

約数列:

[1, 3, 9, 11, 27, 33, 71, 81, 99, 213, 297, 331, 639, 781, 891, 993, 1917, 2343, 2979, 3641, 5751, 7029, 8937, 10923, 21087, 23501, 26811, 32769, 63261, 70503, 98307, 211509, 258511, 294921, 634527, 775533, 1903581, 2326599, 6979797, 20939391]

約数ペア:

[(1, 20939391), (3, 6979797), (9, 2326599), (11, 1903581), (27, 775533), (33, 634527), (71, 294921), (81, 258511), (99, 211509), (213, 98307), (297, 70503), (331, 63261), (639, 32769), (781, 26811), (891, 23501), (993, 21087), (1917, 10923), (2343, 8937), (2979, 7029), (3641, 5751)]