20135423 has 12 divisors (see below), whose sum is σ = 25552872. Its totient is φ = 15689520.

The previous prime is 20135377. The next prime is 20135431. The reversal of 20135423 is 32453102.

It is a happy number.

It is not a de Polignac number, because 20135423 - 2⁶ = 20135359 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20135395 and 20135404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18140 + ... + 19217.

It is an arithmetic number, because the mean of its divisors is an integer number (2129406).

Almost surely, 2^20135423 is an apocalyptic number.

20135423 is a deficient number, since it is larger than the sum of its proper divisors (5417449).

20135423 is a wasteful number, since it uses less digits than its factorization.

20135423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37382 (or 37375 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20135423 is about 4487.2511630173. The cubic root of 20135423 is about 272.0530416671.

Adding to 20135423 its reverse (32453102), we get a palindrome (52588525).

The spelling of 20135423 in words is "twenty million, one hundred thirty-five thousand, four hundred twenty-three".