20208423 has 16 divisors (see below), whose sum is σ = 27669600. Its totient is φ = 13113984.

The previous prime is 20208413. The next prime is 20208431. The reversal of 20208423 is 32480202.

It is not a de Polignac number, because 20208423 - 2¹⁶ = 20142887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20208423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20208403) 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 15 ways as a sum of consecutive naturals, for example, 23265 + ... + 24117.

It is an arithmetic number, because the mean of its divisors is an integer number (1729350).

Almost surely, 2^20208423 is an apocalyptic number.

20208423 is a deficient number, since it is larger than the sum of its proper divisors (7461177).

20208423 is a wasteful number, since it uses less digits than its factorization.

20208423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20208423 is about 4495.3779596381. The cubic root of 20208423 is about 272.3814168550.

Adding to 20208423 its reverse (32480202), we get a palindrome (52688625).

The spelling of 20208423 in words is "twenty million, two hundred eight thousand, four hundred twenty-three".