55112420 has 48 divisors (see below), whose sum is σ = 130346496. Its totient is φ = 19392000.

The previous prime is 55112413. The next prime is 55112423. The reversal of 55112420 is 2421155.

55112420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 55112392 and 55112401.

It is not an unprimeable number, because it can be changed into a prime (55112423) by changing a digit.

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, 2780 + ... + 10860.

It is an arithmetic number, because the mean of its divisors is an integer number (2715552).

Almost surely, 2^55112420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55112420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65173248).

55112420 is an abundant number, since it is smaller than the sum of its proper divisors (75234076).

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

55112420 is a wasteful number, since it uses less digits than its factorization.

55112420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8132 (or 8130 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 55112420 is about 7423.7739728524. The cubic root of 55112420 is about 380.5541775652.

Adding to 55112420 its reverse (2421155), we get a palindrome (57533575).

The spelling of 55112420 in words is "fifty-five million, one hundred twelve thousand, four hundred twenty".