30311220 has 24 divisors (see below), whose sum is σ = 84871584. Its totient is φ = 8082976.

The previous prime is 30311209. The next prime is 30311227. The reversal of 30311220 is 2211303.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 30311196 and 30311205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30311227) 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, 252534 + ... + 252653.

It is an arithmetic number, because the mean of its divisors is an integer number (3536316).

Almost surely, 2^30311220 is an apocalyptic number.

30311220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30311220 is an abundant number, since it is smaller than the sum of its proper divisors (54560364).

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

30311220 is a wasteful number, since it uses less digits than its factorization.

30311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505199 (or 505197 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 30311220 is about 5505.5626415472. The cubic root of 30311220 is about 311.7940373076.

Adding to 30311220 its reverse (2211303), we get a palindrome (32522523).

The spelling of 30311220 in words is "thirty million, three hundred eleven thousand, two hundred twenty".