257788251

素因数分解:

$3^9\times 7^1\times {\mathrm{1871}}^1$

素因数の和:1905

約数の個数: 40

約数和(自身を含む): 442151424

約数和(自身を除く): 184363173

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 729, 1701, 1871, 2187, 5103, 5613, 6561, 13097, 15309, 16839, 19683, 39291, 45927, 50517, 117873, 137781, 151551, 353619, 454653, 1060857, 1363959, 3182571, 4091877, 9547713, 12275631, 28643139, 36826893, 85929417, 257788251]

約数ペア:

[(1, 257788251), (3, 85929417), (7, 36826893), (9, 28643139), (21, 12275631), (27, 9547713), (63, 4091877), (81, 3182571), (189, 1363959), (243, 1060857), (567, 454653), (729, 353619), (1701, 151551), (1871, 137781), (2187, 117873), (5103, 50517), (5613, 45927), (6561, 39291), (13097, 19683), (15309, 16839)]