206423011 has 4 divisors (see below), whose sum is σ = 217287400. Its totient is φ = 195558624.

The previous prime is 206422981. The next prime is 206423053. The reversal of 206423011 is 110324602.

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

It is a cyclic number.

It is not a de Polignac number, because 206423011 - 2⁷ = 206422883 is a prime.

It is a super-2 number, since 2×206423011² = 85220918940612242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 10864369 = 206423011 / (2 + 0 + 6 + 4 + 2 + 3 + 0 + 1 + 1).

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 206423011.

It is not an unprimeable number, because it can be changed into a prime (206423071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5432166 + ... + 5432203.

It is an arithmetic number, because the mean of its divisors is an integer number (54321850).

Almost surely, 2^206423011 is an apocalyptic number.

206423011 is a deficient number, since it is larger than the sum of its proper divisors (10864389).

206423011 is a wasteful number, since it uses less digits than its factorization.

206423011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10864388.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 206423011 is about 14367.4288235578. The cubic root of 206423011 is about 590.9980340501.

Adding to 206423011 its reverse (110324602), we get a palindrome (316747613).

It can be divided in two parts, 20642 and 3011, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 206423011 in words is "two hundred six million, four hundred twenty-three thousand, eleven".