20409725

素因数分解:

$5^2\times 7^2\times {\mathrm{16661}}^1$

素因数の和:16685

約数の個数: 18

約数和(自身を含む): 29441754

約数和(自身を除く): 9032029

約数列:

[1, 5, 7, 25, 35, 49, 175, 245, 1225, 16661, 83305, 116627, 416525, 583135, 816389, 2915675, 4081945, 20409725]

約数ペア:

[(1, 20409725), (5, 4081945), (7, 2915675), (25, 816389), (35, 583135), (49, 416525), (175, 116627), (245, 83305), (1225, 16661)]