206144405 has 4 divisors (see below), whose sum is σ = 247373292. Its totient is φ = 164915520.

The previous prime is 206144387. The next prime is 206144429. The reversal of 206144405 is 504441602.

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 54140164 + 152004241 = 7358^2 + 12329^2 .

It is not a de Polignac number, because 206144405 - 2²⁰ = 205095829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20614436 + ... + 20614445.

It is an arithmetic number, because the mean of its divisors is an integer number (61843323).

Almost surely, 2^206144405 is an apocalyptic number.

It is an amenable number.

206144405 is a deficient number, since it is larger than the sum of its proper divisors (41228887).

206144405 is an equidigital number, since it uses as much as digits as its factorization.

206144405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41228886.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 206144405 is about 14357.7297996584. The cubic root of 206144405 is about 590.7320273183.

The spelling of 206144405 in words is "two hundred six million, one hundred forty-four thousand, four hundred five".