21788109

素因数分解:

$3^5\times 7^1\times {\mathrm{12809}}^1$

素因数の和:12831

約数の個数: 24

約数和(自身を含む): 37302720

約数和(自身を除く): 15514611

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 1701, 12809, 38427, 89663, 115281, 268989, 345843, 806967, 1037529, 2420901, 3112587, 7262703, 21788109]

約数ペア:

[(1, 21788109), (3, 7262703), (7, 3112587), (9, 2420901), (21, 1037529), (27, 806967), (63, 345843), (81, 268989), (189, 115281), (243, 89663), (567, 38427), (1701, 12809)]