206345477 has 4 divisors (see below), whose sum is σ = 222218220. Its totient is φ = 190472736.

The previous prime is 206345459. The next prime is 206345509. The reversal of 206345477 is 774543602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71808676 + 134536801 = 8474^2 + 11599^2 .

It is a cyclic number.

It is not a de Polignac number, because 206345477 - 2²⁰ = 205296901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206345477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206345407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7936352 + ... + 7936377.

It is an arithmetic number, because the mean of its divisors is an integer number (55554555).

Almost surely, 2^206345477 is an apocalyptic number.

It is an amenable number.

206345477 is a deficient number, since it is larger than the sum of its proper divisors (15872743).

206345477 is a wasteful number, since it uses less digits than its factorization.

206345477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15872742.

The product of its (nonzero) digits is 141120, while the sum is 38.

The square root of 206345477 is about 14364.7303142106. The cubic root of 206345477 is about 590.9240303822.

The spelling of 206345477 in words is "two hundred six million, three hundred forty-five thousand, four hundred seventy-seven".