20158812 has 18 divisors (see below), whose sum is σ = 50957088. Its totient is φ = 6719592.

The previous prime is 20158807. The next prime is 20158819. The reversal of 20158812 is 21885102.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20158819) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 279948 + ... + 280019.

Almost surely, 2^20158812 is an apocalyptic number.

It is an amenable number.

20158812 is an abundant number, since it is smaller than the sum of its proper divisors (30798276).

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

20158812 is a wasteful number, since it uses less digits than its factorization.

20158812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559977 (or 559972 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 20158812 is about 4489.8565678649. The cubic root of 20158812 is about 272.1583384607.

The spelling of 20158812 in words is "twenty million, one hundred fifty-eight thousand, eight hundred twelve".