55085820 has 48 divisors (see below), whose sum is σ = 154859040. Its totient is φ = 14630656.

The previous prime is 55085773. The next prime is 55085861. The reversal of 55085820 is 2858055.

55085820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14434 + ... + 17846.

It is an arithmetic number, because the mean of its divisors is an integer number (3226230).

Almost surely, 2^55085820 is an apocalyptic number.

It is an amenable number.

55085820 is an abundant number, since it is smaller than the sum of its proper divisors (99773220).

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

55085820 is a wasteful number, since it uses less digits than its factorization.

55085820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3694 (or 3692 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 33.

The square root of 55085820 is about 7421.9822150151. The cubic root of 55085820 is about 380.4929429098.

The spelling of 55085820 in words is "fifty-five million, eighty-five thousand, eight hundred twenty".