55045220 has 12 divisors (see below), whose sum is σ = 115595004. Its totient is φ = 22018080.

The previous prime is 55045183. The next prime is 55045231. The reversal of 55045220 is 2254055.

It can be written as a sum of positive squares in 2 ways, for example, as 18852964 + 36192256 = 4342^2 + 6016^2 .

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, 1376111 + ... + 1376150.

It is an arithmetic number, because the mean of its divisors is an integer number (9632917).

Almost surely, 2^55045220 is an apocalyptic number.

It is an amenable number.

55045220 is an abundant number, since it is smaller than the sum of its proper divisors (60549784).

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

55045220 is a wasteful number, since it uses less digits than its factorization.

55045220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752270 (or 2752268 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 55045220 is about 7419.2465924782. The cubic root of 55045220 is about 380.3994414711.

Adding to 55045220 its reverse (2254055), we get a palindrome (57299275).

The spelling of 55045220 in words is "fifty-five million, forty-five thousand, two hundred twenty".