206001990 has 96 divisors (see below), whose sum is σ = 574685280. Its totient is φ = 51038208.

The previous prime is 206001973. The next prime is 206002003. The reversal of 206001990 is 99100602.

It is a happy number.

206001990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89494 + ... + 91766.

It is an arithmetic number, because the mean of its divisors is an integer number (5986305).

Almost surely, 2^206001990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206001990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287342640).

206001990 is an abundant number, since it is smaller than the sum of its proper divisors (368683290).

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

206001990 is a wasteful number, since it uses less digits than its factorization.

206001990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358 (or 2355 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 206001990 is about 14352.7694191748. The cubic root of 206001990 is about 590.5959601074.

The spelling of 206001990 in words is "two hundred six million, one thousand, nine hundred ninety".