20205423 has 16 divisors (see below), whose sum is σ = 34210560. Its totient is φ = 11545848.

The previous prime is 20205389. The next prime is 20205467. The reversal of 20205423 is 32450202.

It is not a de Polignac number, because 20205423 - 2¹⁶ = 20139887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20205396 and 20205405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205023) 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, 53265 + ... + 53642.

It is an arithmetic number, because the mean of its divisors is an integer number (2138160).

Almost surely, 2^20205423 is an apocalyptic number.

20205423 is a deficient number, since it is larger than the sum of its proper divisors (14005137).

20205423 is a wasteful number, since it uses less digits than its factorization.

20205423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106923 (or 106917 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20205423 is about 4495.0442711947. The cubic root of 20205423 is about 272.3679375797.

Adding to 20205423 its reverse (32450202), we get a palindrome (52655625).

The spelling of 20205423 in words is "twenty million, two hundred five thousand, four hundred twenty-three".