208039920 has 80 divisors (see below), whose sum is σ = 703562112. Its totient is φ = 50433280.

The previous prime is 208039919. The next prime is 208039957. The reversal of 208039920 is 29930802.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36762 + ... + 42041.

Almost surely, 2^208039920 is an apocalyptic number.

208039920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208039920 is an abundant number, since it is smaller than the sum of its proper divisors (495522192).

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

208039920 is a wasteful number, since it uses less digits than its factorization.

208039920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78830 (or 78824 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 208039920 is about 14423.5890124476. The cubic root of 208039920 is about 592.5371160142.

The spelling of 208039920 in words is "two hundred eight million, thirty-nine thousand, nine hundred twenty".