55230220 has 48 divisors (see below), whose sum is σ = 120556800. Its totient is φ = 21231360.

The previous prime is 55230209. The next prime is 55230247. The reversal of 55230220 is 2203255.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141786 + ... + 142174.

It is an arithmetic number, because the mean of its divisors is an integer number (2511600).

Almost surely, 2^55230220 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 55230220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60278400).

55230220 is an abundant number, since it is smaller than the sum of its proper divisors (65326580).

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

55230220 is a wasteful number, since it uses less digits than its factorization.

55230220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 55230220 is about 7431.7037077645. The cubic root of 55230220 is about 380.8251230247.

Adding to 55230220 its reverse (2203255), we get a palindrome (57433475).

The spelling of 55230220 in words is "fifty-five million, two hundred thirty thousand, two hundred twenty".