20987478

素因数分解:

$2^1\times 3^3\times {\mathrm{388657}}^1$

素因数の和:388668

約数の個数: 16

約数和(自身を含む): 46638960

約数和(自身を除く): 25651482

約数列:

[1, 2, 3, 6, 9, 18, 27, 54, 388657, 777314, 1165971, 2331942, 3497913, 6995826, 10493739, 20987478]

約数ペア:

[(1, 20987478), (2, 10493739), (3, 6995826), (6, 3497913), (9, 2331942), (18, 1165971), (27, 777314), (54, 388657)]