20806384 has 20 divisors (see below), whose sum is σ = 40488480. Its totient is φ = 10357760.

The previous prime is 20806339. The next prime is 20806391. The reversal of 20806384 is 48360802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1104 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (2024424).

Almost surely, 2^20806384 is an apocalyptic number.

It is an amenable number.

20806384 is a deficient number, since it is larger than the sum of its proper divisors (19682096).

20806384 is a wasteful number, since it uses less digits than its factorization.

20806384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688 (or 5682 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20806384 is about 4561.4015390009. The cubic root of 20806384 is about 275.0419065613.

It can be divided in two parts, 2080 and 6384, that added together give a square (8464 = 92²).

The spelling of 20806384 in words is "twenty million, eight hundred six thousand, three hundred eighty-four".