20804112 has 60 divisors (see below), whose sum is σ = 66543360. Its totient is φ = 5943744.

The previous prime is 20804099. The next prime is 20804123. The reversal of 20804112 is 21140802.

It is a super-2 number, since 2×20804112² = 865622152217088, which contains 22 as substring.

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 (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9312 + ... + 11327.

It is an arithmetic number, because the mean of its divisors is an integer number (1109056).

Almost surely, 2^20804112 is an apocalyptic number.

It is an amenable number.

20804112 is an abundant number, since it is smaller than the sum of its proper divisors (45739248).

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

20804112 is a wasteful number, since it uses less digits than its factorization.

20804112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20660 (or 20651 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 20804112 is about 4561.1524859404. The cubic root of 20804112 is about 275.0318949232.

Adding to 20804112 its reverse (21140802), we get a palindrome (41944914).

The spelling of 20804112 in words is "twenty million, eight hundred four thousand, one hundred twelve".