20131212 has 24 divisors (see below), whose sum is σ = 47174512. Its totient is φ = 6681600.

The previous prime is 20131211. The next prime is 20131217. The reversal of 20131212 is 21213102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131211) 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, 589 + ... + 6372.

Almost surely, 2^20131212 is an apocalyptic number.

It is an amenable number.

20131212 is an abundant number, since it is smaller than the sum of its proper divisors (27043300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20131212 is a wasteful number, since it uses less digits than its factorization.

20131212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7209 (or 7207 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20131212 is about 4486.7819202631. The cubic root of 20131212 is about 272.0340751716.

Adding to 20131212 its reverse (21213102), we get a palindrome (41344314).

It can be divided in two parts, 201 and 31212, that added together give a palindrome (31413).

The spelling of 20131212 in words is "twenty million, one hundred thirty-one thousand, two hundred twelve".