505420020404 has 12 divisors (see below), whose sum is σ = 952522346244. Its totient is φ = 233270778624.

The previous prime is 505420020397. The next prime is 505420020439. The reversal of 505420020404 is 404020024505.

It can be written as a sum of positive squares in 2 ways, for example, as 181602117904 + 323817902500 = 426148^2 + 569050^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4859807837 + ... + 4859807940.

It is an arithmetic number, because the mean of its divisors is an integer number (79376862187).

Almost surely, 2^505420020404 is an apocalyptic number.

It is an amenable number.

505420020404 is a deficient number, since it is larger than the sum of its proper divisors (447102325840).

505420020404 is a wasteful number, since it uses less digits than its factorization.

505420020404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9719615794 (or 9719615792 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

Adding to 505420020404 its reverse (404020024505), we get a palindrome (909440044909).

The spelling of 505420020404 in words is "five hundred five billion, four hundred twenty million, twenty thousand, four hundred four".