208020138 has 16 divisors (see below), whose sum is σ = 416314080. Its totient is φ = 69294416.

The previous prime is 208020107. The next prime is 208020149. The reversal of 208020138 is 831020802.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 768 + ... + 20411.

It is an arithmetic number, because the mean of its divisors is an integer number (26019630).

Almost surely, 2^208020138 is an apocalyptic number.

208020138 is an abundant number, since it is smaller than the sum of its proper divisors (208293942).

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

208020138 is a wasteful number, since it uses less digits than its factorization.

208020138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22821.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 208020138 is about 14422.9032444928. The cubic root of 208020138 is about 592.5183344573.

The spelling of 208020138 in words is "two hundred eight million, twenty thousand, one hundred thirty-eight".