30321220 has 12 divisors (see below), whose sum is σ = 63674604. Its totient is φ = 12128480.

The previous prime is 30321197. The next prime is 30321229. The reversal of 30321220 is 2212303.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10536516 + 19784704 = 3246^2 + 4448^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30321220.

It is not an unprimeable number, because it can be changed into a prime (30321229) 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, 758011 + ... + 758050.

It is an arithmetic number, because the mean of its divisors is an integer number (5306217).

Almost surely, 2^30321220 is an apocalyptic number.

It is an amenable number.

30321220 is an abundant number, since it is smaller than the sum of its proper divisors (33353384).

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

30321220 is a wasteful number, since it uses less digits than its factorization.

30321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516070 (or 1516068 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 30321220 is about 5506.4707390487. The cubic root of 30321220 is about 311.8283216151.

Adding to 30321220 its reverse (2212303), we get a palindrome (32533523).

The spelling of 30321220 in words is "thirty million, three hundred twenty-one thousand, two hundred twenty".