206320145 has 16 divisors (see below), whose sum is σ = 260984640. Its totient is φ = 156147264.

The previous prime is 206320139. The next prime is 206320171. The reversal of 206320145 is 541023602.

It is a cyclic number.

It is not a de Polignac number, because 206320145 - 2²⁰ = 205271569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206320145.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102842 + ... + 104828.

It is an arithmetic number, because the mean of its divisors is an integer number (16311540).

Almost surely, 2^206320145 is an apocalyptic number.

It is an amenable number.

206320145 is a deficient number, since it is larger than the sum of its proper divisors (54664495).

206320145 is a wasteful number, since it uses less digits than its factorization.

206320145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3104.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 206320145 is about 14363.8485441751. The cubic root of 206320145 is about 590.8998477988.

Adding to 206320145 its reverse (541023602), we get a palindrome (747343747).

The spelling of 206320145 in words is "two hundred six million, three hundred twenty thousand, one hundred forty-five".