20523249 has 24 divisors (see below), whose sum is σ = 31393440. Its totient is φ = 12883968.

The previous prime is 20523241. The next prime is 20523253. The reversal of 20523249 is 94232502.

It is not a de Polignac number, because 20523249 - 2³ = 20523241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20523241) 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, 43714 + ... + 44180.

It is an arithmetic number, because the mean of its divisors is an integer number (1308060).

Almost surely, 2^20523249 is an apocalyptic number.

It is an amenable number.

20523249 is a deficient number, since it is larger than the sum of its proper divisors (10870191).

20523249 is a wasteful number, since it uses less digits than its factorization.

20523249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 746 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20523249 is about 4530.2592641040. The cubic root of 20523249 is about 273.7886065524.

The spelling of 20523249 in words is "twenty million, five hundred twenty-three thousand, two hundred forty-nine".