20191212 has 36 divisors (see below), whose sum is σ = 51190776. Its totient is φ = 6710400.

The previous prime is 20191181. The next prime is 20191231. The reversal of 20191212 is 21219102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 16212 + ... + 17412.

It is an arithmetic number, because the mean of its divisors is an integer number (1421966).

Almost surely, 2^20191212 is an apocalyptic number.

It is an amenable number.

20191212 is an abundant number, since it is smaller than the sum of its proper divisors (30999564).

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

20191212 is a wasteful number, since it uses less digits than its factorization.

20191212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678 (or 1673 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 20191212 is about 4493.4632523255. The cubic root of 20191212 is about 272.3040681167.

The spelling of 20191212 in words is "twenty million, one hundred ninety-one thousand, two hundred twelve".