25820247 has 12 divisors (see below), whose sum is σ = 34866920. Its totient is φ = 16994880.

The previous prime is 25820233. The next prime is 25820257. The reversal of 25820247 is 74202852.

It is not a de Polignac number, because 25820247 - 2¹⁰ = 25819223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25820227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91747 + ... + 92027.

Almost surely, 2^25820247 is an apocalyptic number.

25820247 is a deficient number, since it is larger than the sum of its proper divisors (9046673).

25820247 is an equidigital number, since it uses as much as digits as its factorization.

25820247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 25820247 is about 5081.3627109271. The cubic root of 25820247 is about 295.5653126209.

The spelling of 25820247 in words is "twenty-five million, eight hundred twenty thousand, two hundred forty-seven".