20161212 has 12 divisors (see below), whose sum is σ = 47042856. Its totient is φ = 6720400.

The previous prime is 20161199. The next prime is 20161237. The reversal of 20161212 is 21216102.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 20161191 and 20161200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840039 + ... + 840062.

It is an arithmetic number, because the mean of its divisors is an integer number (3920238).

Almost surely, 2^20161212 is an apocalyptic number.

It is an amenable number.

20161212 is an abundant number, since it is smaller than the sum of its proper divisors (26881644).

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

20161212 is a wasteful number, since it uses less digits than its factorization.

20161212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680108 (or 1680106 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 20161212 is about 4490.1238290274. The cubic root of 20161212 is about 272.1691386027.

Adding to 20161212 its reverse (21216102), we get a palindrome (41377314).

The spelling of 20161212 in words is "twenty million, one hundred sixty-one thousand, two hundred twelve".