21139612

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{406531}}^1$

素因数の和:406548

約数の個数: 12

約数和(自身を含む): 39840136

約数和(自身を除く): 18700524

約数列:

[1, 2, 4, 13, 26, 52, 406531, 813062, 1626124, 5284903, 10569806, 21139612]

約数ペア:

[(1, 21139612), (2, 10569806), (4, 5284903), (13, 1626124), (26, 813062), (52, 406531)]