206143645 has 16 divisors (see below), whose sum is σ = 260794368. Its totient is φ = 156193920.

The previous prime is 206143643. The next prime is 206143661. The reversal of 206143645 is 546341602.

It is not a de Polignac number, because 206143645 - 2¹ = 206143643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206143643) 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 15 ways as a sum of consecutive naturals, for example, 6864 + ... + 21433.

It is an arithmetic number, because the mean of its divisors is an integer number (16299648).

Almost surely, 2^206143645 is an apocalyptic number.

It is an amenable number.

206143645 is a deficient number, since it is larger than the sum of its proper divisors (54650723).

206143645 is a wasteful number, since it uses less digits than its factorization.

206143645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28380.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 206143645 is about 14357.7033330544. The cubic root of 206143645 is about 590.7313013597.

The spelling of 206143645 in words is "two hundred six million, one hundred forty-three thousand, six hundred forty-five".