20131423535 has 16 divisors (see below), whose sum is σ = 24267675936. Its totient is φ = 16031996928.

The previous prime is 20131423517. The next prime is 20131423537. The reversal of 20131423535 is 53532413102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20131423535 - 2⁶ = 20131423471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20131423498 and 20131423507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131423537) 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, 979232 + ... + 999578.

It is an arithmetic number, because the mean of its divisors is an integer number (1516729746).

Almost surely, 2^20131423535 is an apocalyptic number.

20131423535 is a deficient number, since it is larger than the sum of its proper divisors (4136252401).

20131423535 is a wasteful number, since it uses less digits than its factorization.

20131423535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21242.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 20131423535 its reverse (53532413102), we get a palindrome (73663836637).

The spelling of 20131423535 in words is "twenty billion, one hundred thirty-one million, four hundred twenty-three thousand, five hundred thirty-five".