505405020 has 48 divisors (see below), whose sum is σ = 1424656800. Its totient is φ = 133867776.

The previous prime is 505405007. The next prime is 505405037. The reversal of 505405020 is 20504505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19327 + ... + 37206.

It is an arithmetic number, because the mean of its divisors is an integer number (29680350).

Almost surely, 2^505405020 is an apocalyptic number.

It is an amenable number.

505405020 is an abundant number, since it is smaller than the sum of its proper divisors (919251780).

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

505405020 is a wasteful number, since it uses less digits than its factorization.

505405020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56694 (or 56692 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 505405020 is about 22481.2148248265. The cubic root of 505405020 is about 796.5502600839.

Adding to 505405020 its reverse (20504505), we get a palindrome (525909525).

The spelling of 505405020 in words is "five hundred five million, four hundred five thousand, twenty".