25520207 has 4 divisors (see below), whose sum is σ = 25768080. Its totient is φ = 25272336.

The previous prime is 25520191. The next prime is 25520221. The reversal of 25520207 is 70202552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25520207 - 2⁴ = 25520191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123782 + ... + 123987.

It is an arithmetic number, because the mean of its divisors is an integer number (6442020).

Almost surely, 2^25520207 is an apocalyptic number.

25520207 is a deficient number, since it is larger than the sum of its proper divisors (247873).

25520207 is a wasteful number, since it uses less digits than its factorization.

25520207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247872.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 25520207 is about 5051.7528641057. The cubic root of 25520207 is about 294.4159929420.

Adding to 25520207 its reverse (70202552), we get a palindrome (95722759).

The spelling of 25520207 in words is "twenty-five million, five hundred twenty thousand, two hundred seven".