19917989

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{4657}}^1$

素因数の和:4724

約数の個数: 16

約数和(自身を含む): 25041408

約数和(自身を除く): 5123419

約数列:

[1, 7, 13, 47, 91, 329, 611, 4277, 4657, 32599, 60541, 218879, 423787, 1532153, 2845427, 19917989]

約数ペア:

[(1, 19917989), (7, 2845427), (13, 1532153), (47, 423787), (91, 218879), (329, 60541), (611, 32599), (4277, 4657)]