20809200 has 60 divisors (see below), whose sum is σ = 66662648. Its totient is φ = 5548800.

The previous prime is 20809189. The next prime is 20809213. The reversal of 20809200 is 290802.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7471 + ... + 9870.

Almost surely, 2^20809200 is an apocalyptic number.

20809200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20809200 is an abundant number, since it is smaller than the sum of its proper divisors (45853448).

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

20809200 is a wasteful number, since it uses less digits than its factorization.

20809200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17362 (or 17351 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20809200 is about 4561.7102056137. The cubic root of 20809200 is about 275.0543143407.

The spelling of 20809200 in words is "twenty million, eight hundred nine thousand, two hundred".