20131223 has 8 divisors (see below), whose sum is σ = 23063040. Its totient is φ = 17213400.

The previous prime is 20131217. The next prime is 20131229. The reversal of 20131223 is 32213102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20131217) and next prime (20131229).

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 20131223 - 2⁴ = 20131207 is a prime.

It is a super-2 number, since 2×20131223² = 810532278951458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20131198 and 20131207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131229) 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, 203 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (2882880).

Almost surely, 2^20131223 is an apocalyptic number.

20131223 is a deficient number, since it is larger than the sum of its proper divisors (2931817).

20131223 is an equidigital number, since it uses as much as digits as its factorization.

20131223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20131223 is about 4486.7831460858. The cubic root of 20131223 is about 272.0341247194.

Adding to 20131223 its reverse (32213102), we get a palindrome (52344325).

The spelling of 20131223 in words is "twenty million, one hundred thirty-one thousand, two hundred twenty-three".