30516820 has 24 divisors (see below), whose sum is σ = 64215144. Its totient is φ = 12182016.

The previous prime is 30516809. The next prime is 30516821. The reversal of 30516820 is 2861503.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 617796 + 29899024 = 786^2 + 5468^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30516821) 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, 11104 + ... + 13576.

It is an arithmetic number, because the mean of its divisors is an integer number (2675631).

Almost surely, 2^30516820 is an apocalyptic number.

It is an amenable number.

30516820 is an abundant number, since it is smaller than the sum of its proper divisors (33698324).

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

30516820 is a wasteful number, since it uses less digits than its factorization.

30516820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099 (or 3097 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 30516820 is about 5524.2031099517. The cubic root of 30516820 is about 312.4974122452.

The spelling of 30516820 in words is "thirty million, five hundred sixteen thousand, eight hundred twenty".