Revision 6bff5be7-dc82-443e-81e8-f28c06e5284f - Code Golf Stack Exchange

# [Python 3], 69 bytes

<!-- language-all: lang-python -->

 lambda n:sum(max(j for j in range(1,i)if i%j<1)for i in range(2,n+1))

[Try it online!][TIO-j4b7e1sk]

[Python 3]: https://docs.python.org/3/
[TIO-j4b7e1sk]: https://tio.run/##TczNCgIhFAXgfU9xIQKlWfgzf0a9SRujLCWdwSaopzeN1O7yO@fc@b3cJseDOhzDXdrTWYLbPZ4WWflCBtTkwYB24KW7XhBtNNYK9MbsKU6Zrhlr3JZiHGav3YIUYhhDvDXQVaY2U1uozzQWGsuQF6PdF@OyfuPDzxgTtUhI0jjuBfnXxEk7NojwAQ "Python 3 – Try It Online"