20012 has 6 divisors (see below), whose sum is σ = 35028. Its totient is φ = 10004.

The previous prime is 20011. The next prime is 20021. The reversal of 20012 is 21002.

It is a plaindrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 19978 and 20005.

It is not an unprimeable number, because it can be changed into a prime (20011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2498 + ... + 2505.

It is an arithmetic number, because the mean of its divisors is an integer number (5838).

2²⁰⁰¹² is an apocalyptic number.

It is an amenable number.

20012 is a deficient number, since it is larger than the sum of its proper divisors (15016).

20012 is a wasteful number, since it uses less digits than its factorization.

20012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5007 (or 5005 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 20012 is about 141.4637762821. The cubic root of 20012 is about 27.1496039158.

Adding to 20012 its reverse (21002), we get a palindrome (41014).

Subtracting 20012 from its reverse (21002), we obtain a triangular number (990 = T₄₄).

Multiplying 20012 by its reverse (21002), we get a palindrome (420292024).

It can be divided in two parts, 200 and 12, that added together give a palindrome (212).

The spelling of 20012 in words is "twenty thousand, twelve", and thus it is an iban number.