30051220 has 24 divisors (see below), whose sum is σ = 63670824. Its totient is φ = 11913216.

The previous prime is 30051211. The next prime is 30051227. The reversal of 30051220 is 2215003.

It can be written as a sum of positive squares in 4 ways, for example, as 3857296 + 26193924 = 1964^2 + 5118^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30051220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30051227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4389 + ... + 8908.

It is an arithmetic number, because the mean of its divisors is an integer number (2652951).

Almost surely, 2^30051220 is an apocalyptic number.

It is an amenable number.

30051220 is an abundant number, since it is smaller than the sum of its proper divisors (33619604).

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

30051220 is a wasteful number, since it uses less digits than its factorization.

30051220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13419 (or 13417 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 30051220 is about 5481.8993058975. The cubic root of 30051220 is about 310.8999861058.

Adding to 30051220 its reverse (2215003), we get a palindrome (32266223).

It can be divided in two parts, 3005 and 1220, that added together give a square (4225 = 65²).

The spelling of 30051220 in words is "thirty million, fifty-one thousand, two hundred twenty".