208864820 has 24 divisors (see below), whose sum is σ = 439149984. Its totient is φ = 83444256.

The previous prime is 208864813. The next prime is 208864823. The reversal of 208864820 is 28468802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208864823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11747 + ... + 23573.

It is an arithmetic number, because the mean of its divisors is an integer number (18297916).

Almost surely, 2^208864820 is an apocalyptic number.

208864820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208864820 is an abundant number, since it is smaller than the sum of its proper divisors (230285164).

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

208864820 is a wasteful number, since it uses less digits than its factorization.

208864820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12719 (or 12717 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 208864820 is about 14452.1562405061. The cubic root of 208864820 is about 593.3192403616.

The spelling of 208864820 in words is "two hundred eight million, eight hundred sixty-four thousand, eight hundred twenty".