206039990 has 32 divisors (see below), whose sum is σ = 420426720. Its totient is φ = 72071424.

The previous prime is 206039969. The next prime is 206040007. The reversal of 206039990 is 99930602.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39239 + ... + 44178.

It is an arithmetic number, because the mean of its divisors is an integer number (13138335).

Almost surely, 2^206039990 is an apocalyptic number.

206039990 is an abundant number, since it is smaller than the sum of its proper divisors (214386730).

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

206039990 is a wasteful number, since it uses less digits than its factorization.

206039990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83456.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 206039990 is about 14354.0931444658. The cubic root of 206039990 is about 590.6322724859.

The spelling of 206039990 in words is "two hundred six million, thirty-nine thousand, nine hundred ninety".