30520209 has 16 divisors (see below), whose sum is σ = 42897600. Its totient is φ = 19271616.

The previous prime is 30520207. The next prime is 30520223. The reversal of 30520209 is 90202503.

It is not a de Polignac number, because 30520209 - 2¹ = 30520207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30520207) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1302 + ... + 7920.

It is an arithmetic number, because the mean of its divisors is an integer number (2681100).

Almost surely, 2^30520209 is an apocalyptic number.

It is an amenable number.

30520209 is a deficient number, since it is larger than the sum of its proper divisors (12377391).

30520209 is a wasteful number, since it uses less digits than its factorization.

30520209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6704.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 30520209 is about 5524.5098425109. The cubic root of 30520209 is about 312.5089797953.

The spelling of 30520209 in words is "thirty million, five hundred twenty thousand, two hundred nine".