55543220 has 12 divisors (see below), whose sum is σ = 116640804. Its totient is φ = 22217280.

The previous prime is 55543219. The next prime is 55543231. The reversal of 55543220 is 2234555.

It can be written as a sum of positive squares in 2 ways, for example, as 12588304 + 42954916 = 3548^2 + 6554^2 .

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 55543220.

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, 1388561 + ... + 1388600.

It is an arithmetic number, because the mean of its divisors is an integer number (9720067).

Almost surely, 2^55543220 is an apocalyptic number.

It is an amenable number.

55543220 is an abundant number, since it is smaller than the sum of its proper divisors (61097584).

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

55543220 is a wasteful number, since it uses less digits than its factorization.

55543220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777170 (or 2777168 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 55543220 is about 7452.7323848371. The cubic root of 55543220 is about 381.5431707217.

Adding to 55543220 its reverse (2234555), we get a palindrome (57777775).

The spelling of 55543220 in words is "fifty-five million, five hundred forty-three thousand, two hundred twenty".