30520025 has 6 divisors (see below), whose sum is σ = 37844862. Its totient is φ = 24416000.

The previous prime is 30520019. The next prime is 30520043. The reversal of 30520025 is 52002503.

It can be written as a sum of positive squares in 3 ways, for example, as 1993744 + 28526281 = 1412^2 + 5341^2 .

It is not a de Polignac number, because 30520025 - 2¹⁰ = 30519001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30519985 and 30520012.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 610376 + ... + 610425.

It is an arithmetic number, because the mean of its divisors is an integer number (6307477).

Almost surely, 2^30520025 is an apocalyptic number.

It is an amenable number.

30520025 is a deficient number, since it is larger than the sum of its proper divisors (7324837).

30520025 is a wasteful number, since it uses less digits than its factorization.

30520025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220811 (or 1220806 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 17.

The square root of 30520025 is about 5524.4931894247. The cubic root of 30520025 is about 312.5083517768.

Adding to 30520025 its reverse (52002503), we get a palindrome (82522528).

The spelling of 30520025 in words is "thirty million, five hundred twenty thousand, twenty-five".