20823249 has 16 divisors (see below), whose sum is σ = 29574720. Its totient is φ = 12986880.

The previous prime is 20823239. The next prime is 20823263. The reversal of 20823249 is 94232802.

It is not a de Polignac number, because 20823249 - 2¹³ = 20815057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20823239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7989 + ... + 10269.

It is an arithmetic number, because the mean of its divisors is an integer number (1848420).

Almost surely, 2^20823249 is an apocalyptic number.

It is an amenable number.

20823249 is a deficient number, since it is larger than the sum of its proper divisors (8751471).

20823249 is a wasteful number, since it uses less digits than its factorization.

20823249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20823249 is about 4563.2498287953. The cubic root of 20823249 is about 275.1161999292.

The spelling of 20823249 in words is "twenty million, eight hundred twenty-three thousand, two hundred forty-nine".