20640425

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{1549}}^1$

素因数の和:1613

約数の個数: 24

約数和(自身を含む): 28253400

約数和(自身を除く): 7612975

約数列:

[1, 5, 13, 25, 41, 65, 205, 325, 533, 1025, 1549, 2665, 7745, 13325, 20137, 38725, 63509, 100685, 317545, 503425, 825617, 1587725, 4128085, 20640425]

約数ペア:

[(1, 20640425), (5, 4128085), (13, 1587725), (25, 825617), (41, 503425), (65, 317545), (205, 100685), (325, 63509), (533, 38725), (1025, 20137), (1549, 13325), (2665, 7745)]