640775

素因数分解:

$5^2\times {\mathrm{19}}^2\times {\mathrm{71}}^1$

素因数の和:119

約数の個数: 18

約数和(自身を含む): 850392

約数和(自身を除く): 209617

約数列:

[1, 5, 19, 25, 71, 95, 355, 361, 475, 1349, 1775, 1805, 6745, 9025, 25631, 33725, 128155, 640775]

約数ペア:

[(1, 640775), (5, 128155), (19, 33725), (25, 25631), (71, 9025), (95, 6745), (355, 1805), (361, 1775), (475, 1349)]