505165220 has 24 divisors (see below), whose sum is σ = 1212396864. Its totient is φ = 173199456.

The previous prime is 505165201. The next prime is 505165229. The reversal of 505165220 is 22561505.

It is a self number, because there is not a number n which added to its sum of digits gives 505165220.

It is not an unprimeable number, because it can be changed into a prime (505165229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1804022 + ... + 1804301.

It is an arithmetic number, because the mean of its divisors is an integer number (50516536).

Almost surely, 2^505165220 is an apocalyptic number.

It is an amenable number.

505165220 is an abundant number, since it is smaller than the sum of its proper divisors (707231644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505165220 is a wasteful number, since it uses less digits than its factorization.

505165220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608339 (or 3608337 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 505165220 is about 22475.8808503694. The cubic root of 505165220 is about 796.4242601679.

The spelling of 505165220 in words is "five hundred five million, one hundred sixty-five thousand, two hundred twenty".