55031320 has 16 divisors (see below), whose sum is σ = 123820560. Its totient is φ = 22012512.

The previous prime is 55031311. The next prime is 55031371. The reversal of 55031320 is 2313055.

55031320 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 3 ways as a sum of consecutive naturals, for example, 687852 + ... + 687931.

It is an arithmetic number, because the mean of its divisors is an integer number (7738785).

Almost surely, 2^55031320 is an apocalyptic number.

It is an amenable number.

55031320 is an abundant number, since it is smaller than the sum of its proper divisors (68789240).

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

55031320 is a wasteful number, since it uses less digits than its factorization.

55031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375794 (or 1375790 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 55031320 is about 7418.3097805363. The cubic root of 55031320 is about 380.3674193302.

Adding to 55031320 its reverse (2313055), we get a palindrome (57344375).

The spelling of 55031320 in words is "fifty-five million, thirty-one thousand, three hundred twenty".