55304220 has 24 divisors (see below), whose sum is σ = 154851984. Its totient is φ = 14747776.

The previous prime is 55304219. The next prime is 55304239. The reversal of 55304220 is 2240355.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460809 + ... + 460928.

It is an arithmetic number, because the mean of its divisors is an integer number (6452166).

Almost surely, 2^55304220 is an apocalyptic number.

It is an amenable number.

55304220 is an abundant number, since it is smaller than the sum of its proper divisors (99547764).

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

55304220 is a wasteful number, since it uses less digits than its factorization.

55304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921749 (or 921747 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 55304220 is about 7436.6807111775. The cubic root of 55304220 is about 380.9951294836.

Adding to 55304220 its reverse (2240355), we get a palindrome (57544575).

The spelling of 55304220 in words is "fifty-five million, three hundred four thousand, two hundred twenty".