30555220 has 12 divisors (see below), whose sum is σ = 64166004. Its totient is φ = 12222080.

The previous prime is 30555199. The next prime is 30555221. The reversal of 30555220 is 2255503.

It can be written as a sum of positive squares in 2 ways, for example, as 8596624 + 21958596 = 2932^2 + 4686^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30555191 and 30555200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30555221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763861 + ... + 763900.

It is an arithmetic number, because the mean of its divisors is an integer number (5347167).

Almost surely, 2^30555220 is an apocalyptic number.

It is an amenable number.

30555220 is an abundant number, since it is smaller than the sum of its proper divisors (33610784).

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

30555220 is a wasteful number, since it uses less digits than its factorization.

30555220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527770 (or 1527768 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 30555220 is about 5527.6776317003. The cubic root of 30555220 is about 312.6284314766.

The spelling of 30555220 in words is "thirty million, five hundred fifty-five thousand, two hundred twenty".