217438991

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{1283}}^1$

素因数の和:1403

約数の個数: 32

約数和(自身を含む): 284000256

約数和(自身を除く): 66561265

約数列:

[1, 7, 11, 31, 71, 77, 217, 341, 497, 781, 1283, 2201, 2387, 5467, 8981, 14113, 15407, 24211, 39773, 91093, 98791, 169477, 278411, 437503, 637651, 1002023, 2823883, 3062521, 7014161, 19767181, 31062713, 217438991]

約数ペア:

[(1, 217438991), (7, 31062713), (11, 19767181), (31, 7014161), (71, 3062521), (77, 2823883), (217, 1002023), (341, 637651), (497, 437503), (781, 278411), (1283, 169477), (2201, 98791), (2387, 91093), (5467, 39773), (8981, 24211), (14113, 15407)]