25820305 has 12 divisors (see below), whose sum is σ = 36043380. Its totient is φ = 17705184.

The previous prime is 25820287. The next prime is 25820321. The reversal of 25820305 is 50302852.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 10233601 = 3948^2 + 3199^2 .

It is not a de Polignac number, because 25820305 - 2⁹ = 25819793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25820305.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 52450 + ... + 52939.

It is an arithmetic number, because the mean of its divisors is an integer number (3003615).

Almost surely, 2^25820305 is an apocalyptic number.

It is an amenable number.

25820305 is a deficient number, since it is larger than the sum of its proper divisors (10223075).

25820305 is a wasteful number, since it uses less digits than its factorization.

25820305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105408 (or 105401 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 25820305 is about 5081.3684180543. The cubic root of 25820305 is about 295.5655339301.

The spelling of 25820305 in words is "twenty-five million, eight hundred twenty thousand, three hundred five".