30011820 has 24 divisors (see below), whose sum is σ = 84033264. Its totient is φ = 8003136.

The previous prime is 30011809. The next prime is 30011837. The reversal of 30011820 is 2811003.

It is a happy number.

30011820 is nontrivially palindromic in base 9.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 30011820.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250039 + ... + 250158.

It is an arithmetic number, because the mean of its divisors is an integer number (3501386).

Almost surely, 2^30011820 is an apocalyptic number.

30011820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30011820 is an abundant number, since it is smaller than the sum of its proper divisors (54021444).

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

30011820 is a wasteful number, since it uses less digits than its factorization.

30011820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500209 (or 500207 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 30011820 is about 5478.3044822281. The cubic root of 30011820 is about 310.7640535573.

Adding to 30011820 its reverse (2811003), we get a palindrome (32822823).

The spelling of 30011820 in words is "thirty million, eleven thousand, eight hundred twenty".