20836904 has 16 divisors (see below), whose sum is σ = 42621120. Its totient is φ = 9471280.

The previous prime is 20836903. The next prime is 20836909. The reversal of 20836904 is 40963802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836903) 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 3 ways as a sum of consecutive naturals, for example, 118304 + ... + 118479.

It is an arithmetic number, because the mean of its divisors is an integer number (2663820).

Almost surely, 2^20836904 is an apocalyptic number.

It is an amenable number.

20836904 is an abundant number, since it is smaller than the sum of its proper divisors (21784216).

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

20836904 is a wasteful number, since it uses less digits than its factorization.

20836904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236800 (or 236796 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20836904 is about 4564.7457760537. The cubic root of 20836904 is about 275.1763232853.

The spelling of 20836904 in words is "twenty million, eight hundred thirty-six thousand, nine hundred four".