18205825 has 24 divisors (see below), whose sum is σ = 24819840. Its totient is φ = 13137600.

The previous prime is 18205753. The next prime is 18205829. The reversal of 18205825 is 52850281.

It is not a de Polignac number, because 18205825 - 2²³ = 9817217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18205829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65587 + ... + 65863.

It is an arithmetic number, because the mean of its divisors is an integer number (1034160).

Almost surely, 2^18205825 is an apocalyptic number.

It is an amenable number.

18205825 is a deficient number, since it is larger than the sum of its proper divisors (6614015).

18205825 is a wasteful number, since it uses less digits than its factorization.

18205825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 18205825 is about 4266.8284474537. The cubic root of 18205825 is about 263.0692709821.

The spelling of 18205825 in words is "eighteen million, two hundred five thousand, eight hundred twenty-five".