20131023 has 8 divisors (see below), whose sum is σ = 29281536. Its totient is φ = 12200600.

The previous prime is 20131019. The next prime is 20131031. The reversal of 20131023 is 32013102.

It is a happy number.

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 20131023 - 2² = 20131019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304983 + ... + 305048.

It is an arithmetic number, because the mean of its divisors is an integer number (3660192).

Almost surely, 2^20131023 is an apocalyptic number.

20131023 is a deficient number, since it is larger than the sum of its proper divisors (9150513).

20131023 is a wasteful number, since it uses less digits than its factorization.

20131023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610045.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20131023 is about 4486.7608583476. The cubic root of 20131023 is about 272.0332238468.

Adding to 20131023 its reverse (32013102), we get a palindrome (52144125).

It can be divided in two parts, 2013102 and 3, that multiplied together give a palindrome (6039306).

The spelling of 20131023 in words is "twenty million, one hundred thirty-one thousand, twenty-three".