30331220 has 36 divisors (see below), whose sum is σ = 67240404. Its totient is φ = 11491200.

The previous prime is 30331207. The next prime is 30331243. The reversal of 30331220 is 2213303.

It can be written as a sum of positive squares in 2 ways, for example, as 5550736 + 24780484 = 2356^2 + 4978^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30331195 and 30331204.

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 11 ways as a sum of consecutive naturals, for example, 5120 + ... + 9320.

It is an arithmetic number, because the mean of its divisors is an integer number (1867789).

Almost surely, 2^30331220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33620202).

30331220 is an abundant number, since it is smaller than the sum of its proper divisors (36909184).

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

30331220 is a wasteful number, since it uses less digits than its factorization.

30331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248 (or 4227 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 30331220 is about 5507.3786868164. The cubic root of 30331220 is about 311.8625983853.

Adding to 30331220 its reverse (2213303), we get a palindrome (32544523).

The spelling of 30331220 in words is "thirty million, three hundred thirty-one thousand, two hundred twenty".