20005423 has 8 divisors (see below), whose sum is σ = 21974400. Its totient is φ = 18128088.

The previous prime is 20005397. The next prime is 20005429. The reversal of 20005423 is 32450002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20005423 - 2²¹ = 17908271 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20005397 and 20005406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22453 + ... + 23326.

It is an arithmetic number, because the mean of its divisors is an integer number (2746800).

Almost surely, 2^20005423 is an apocalyptic number.

20005423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20005423 is a deficient number, since it is larger than the sum of its proper divisors (1968977).

20005423 is a wasteful number, since it uses less digits than its factorization.

20005423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45821.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20005423 is about 4472.7422237370. The cubic root of 20005423 is about 271.4662932536.

Adding to 20005423 its reverse (32450002), we get a palindrome (52455425).

The spelling of 20005423 in words is "twenty million, five thousand, four hundred twenty-three".