30231220 has 24 divisors (see below), whose sum is σ = 65202984. Its totient is φ = 11765376.

The previous prime is 30231209. The next prime is 30231239. The reversal of 30231220 is 2213203.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18766224 + 11464996 = 4332^2 + 3386^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30231220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19687 + ... + 21166.

It is an arithmetic number, because the mean of its divisors is an integer number (2716791).

Almost surely, 2^30231220 is an apocalyptic number.

It is an amenable number.

30231220 is an abundant number, since it is smaller than the sum of its proper divisors (34971764).

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

30231220 is a wasteful number, since it uses less digits than its factorization.

30231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40899 (or 40897 counting only the distinct ones).

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

The square root of 30231220 is about 5498.2924622104. The cubic root of 30231220 is about 311.5194910111.

Adding to 30231220 its reverse (2213203), we get a palindrome (32444423).

The spelling of 30231220 in words is "thirty million, two hundred thirty-one thousand, two hundred twenty".