20434423 has 4 divisors (see below), whose sum is σ = 20468160. Its totient is φ = 20400688.

The previous prime is 20434411. The next prime is 20434457. The reversal of 20434423 is 32443402.

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

It is a cyclic number.

It is not a de Polignac number, because 20434423 - 2¹⁷ = 20303351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20434394 and 20434403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15943 + ... + 17176.

It is an arithmetic number, because the mean of its divisors is an integer number (5117040).

Almost surely, 2^20434423 is an apocalyptic number.

20434423 is a deficient number, since it is larger than the sum of its proper divisors (33737).

20434423 is an equidigital number, since it uses as much as digits as its factorization.

20434423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33736.

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 20434423 is about 4520.4450002185. The cubic root of 20434423 is about 273.3930435023.

Adding to 20434423 its reverse (32443402), we get a palindrome (52877825).

The spelling of 20434423 in words is "twenty million, four hundred thirty-four thousand, four hundred twenty-three".