20 What are Pseudoperfect Numbers?

A054377 – OEIS

Natural numbers N are called pseudoperfect if they satisfy the following formula:

where p is a divisor of N and a prime number.

The known pseudoperfect numbers are
2,
6,
42,
1806,
47058,
2214502422,
52495396602,
8490421583559688410706771261086