30820240 has 40 divisors (see below), whose sum is σ = 78173568. Its totient is φ = 11207040.

The previous prime is 30820217. The next prime is 30820241. The reversal of 30820240 is 4202803.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (30820241) 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, 16632 + ... + 18391.

Almost surely, 2^30820240 is an apocalyptic number.

It is an amenable number.

30820240 is an abundant number, since it is smaller than the sum of its proper divisors (47353328).

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

30820240 is a wasteful number, since it uses less digits than its factorization.

30820240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35047 (or 35041 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 30820240 is about 5551.5979681530. The cubic root of 30820240 is about 313.5296893080.

The spelling of 30820240 in words is "thirty million, eight hundred twenty thousand, two hundred forty".