20557719

素因数分解:

$3^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2789}}^1$

素因数の和:2821

約数の個数: 40

約数和(自身を含む): 37810080

約数和(自身を除く): 17252361

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 63, 81, 91, 117, 189, 273, 351, 567, 819, 1053, 2457, 2789, 7371, 8367, 19523, 25101, 36257, 58569, 75303, 108771, 175707, 225909, 253799, 326313, 527121, 761397, 978939, 1581363, 2284191, 2936817, 6852573, 20557719]

約数ペア:

[(1, 20557719), (3, 6852573), (7, 2936817), (9, 2284191), (13, 1581363), (21, 978939), (27, 761397), (39, 527121), (63, 326313), (81, 253799), (91, 225909), (117, 175707), (189, 108771), (273, 75303), (351, 58569), (567, 36257), (819, 25101), (1053, 19523), (2457, 8367), (2789, 7371)]