25920047 has 4 divisors (see below), whose sum is σ = 27284280. Its totient is φ = 24555816.

The previous prime is 25920031. The next prime is 25920079. The reversal of 25920047 is 74002952.

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 25920047 - 2⁴ = 25920031 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 (25920007) 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, 682088 + ... + 682125.

It is an arithmetic number, because the mean of its divisors is an integer number (6821070).

Almost surely, 2^25920047 is an apocalyptic number.

25920047 is a deficient number, since it is larger than the sum of its proper divisors (1364233).

25920047 is a wasteful number, since it uses less digits than its factorization.

25920047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364232.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 25920047 is about 5091.1734403770. The cubic root of 25920047 is about 295.9456277960.

Adding to 25920047 its reverse (74002952), we get a palindrome (99922999).

The spelling of 25920047 in words is "twenty-five million, nine hundred twenty thousand, forty-seven".