20469823 has 4 divisors (see below), whose sum is σ = 22330728. Its totient is φ = 18608920.

The previous prime is 20469811. The next prime is 20469829. The reversal of 20469823 is 32896402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20469823 - 2⁵ = 20469791 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 (20469829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930436 + ... + 930457.

It is an arithmetic number, because the mean of its divisors is an integer number (5582682).

Almost surely, 2^20469823 is an apocalyptic number.

20469823 is a deficient number, since it is larger than the sum of its proper divisors (1860905).

20469823 is a wasteful number, since it uses less digits than its factorization.

20469823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860904.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20469823 is about 4524.3588496051. The cubic root of 20469823 is about 273.5508251439.

The spelling of 20469823 in words is "twenty million, four hundred sixty-nine thousand, eight hundred twenty-three".