55131020 has 48 divisors (see below), whose sum is σ = 136593408. Its totient is φ = 18290880.

The previous prime is 55130981. The next prime is 55131049. The reversal of 55131020 is 2013155.

55131020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 55131020.

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, 2012 + ... + 10691.

It is an arithmetic number, because the mean of its divisors is an integer number (2845696).

Almost surely, 2^55131020 is an apocalyptic number.

It is an amenable number.

55131020 is an abundant number, since it is smaller than the sum of its proper divisors (81462388).

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

55131020 is a wasteful number, since it uses less digits than its factorization.

55131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12750 (or 12748 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 55131020 is about 7425.0265992790. The cubic root of 55131020 is about 380.5969840781.

Adding to 55131020 its reverse (2013155), we get a palindrome (57144175).

The spelling of 55131020 in words is "fifty-five million, one hundred thirty-one thousand, twenty".