20816012 has 24 divisors (see below), whose sum is σ = 43443456. Its totient is φ = 8533008.

The previous prime is 20816009. The next prime is 20816021. The reversal of 20816012 is 21061802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15518 + ... + 16805.

It is an arithmetic number, because the mean of its divisors is an integer number (1810144).

Almost surely, 2^20816012 is an apocalyptic number.

It is an amenable number.

20816012 is an abundant number, since it is smaller than the sum of its proper divisors (22627444).

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

20816012 is a wasteful number, since it uses less digits than its factorization.

20816012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32357 (or 32355 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20816012 is about 4562.4567943160. The cubic root of 20816012 is about 275.0843245537.

Adding to 20816012 its reverse (21061802), we get a palindrome (41877814).

The spelling of 20816012 in words is "twenty million, eight hundred sixteen thousand, twelve".