206890818 has 16 divisors (see below), whose sum is σ = 415950336. Its totient is φ = 68602160.

The previous prime is 206890811. The next prime is 206890823. The reversal of 206890818 is 818098602.

It is a self number, because there is not a number n which added to its sum of digits gives 206890818.

It is not an unprimeable number, because it can be changed into a prime (206890811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89121 + ... + 91412.

It is an arithmetic number, because the mean of its divisors is an integer number (25996896).

Almost surely, 2^206890818 is an apocalyptic number.

206890818 is an abundant number, since it is smaller than the sum of its proper divisors (209059518).

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

206890818 is a wasteful number, since it uses less digits than its factorization.

206890818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180729.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 206890818 is about 14383.6997326835. The cubic root of 206890818 is about 591.4441477946. Note that the first 3 decimals are identical.

The spelling of 206890818 in words is "two hundred six million, eight hundred ninety thousand, eight hundred eighteen".