20231213 has 8 divisors (see below), whose sum is σ = 20849400. Its totient is φ = 19621888.

The previous prime is 20231203. The next prime is 20231243. The reversal of 20231213 is 31213202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6666724 + 13564489 = 2582^2 + 3683^2 .

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 20231213 - 2⁶ = 20231149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231203) 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, 2573 + ... + 6861.

It is an arithmetic number, because the mean of its divisors is an integer number (2606175).

Almost surely, 2^20231213 is an apocalyptic number.

It is an amenable number.

20231213 is a deficient number, since it is larger than the sum of its proper divisors (618187).

20231213 is an equidigital number, since it uses as much as digits as its factorization.

20231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4431.

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

The square root of 20231213 is about 4497.9120711726. The cubic root of 20231213 is about 272.4837708821.

Adding to 20231213 its reverse (31213202), we get a palindrome (51444415).

The spelling of 20231213 in words is "twenty million, two hundred thirty-one thousand, two hundred thirteen".