206740563 has 4 divisors (see below), whose sum is σ = 275654088. Its totient is φ = 137827040.

The previous prime is 206740531. The next prime is 206740579. The reversal of 206740563 is 365047602.

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 206740563 - 2⁵ = 206740531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206740063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34456758 + ... + 34456763.

It is an arithmetic number, because the mean of its divisors is an integer number (68913522).

Almost surely, 2^206740563 is an apocalyptic number.

206740563 is a deficient number, since it is larger than the sum of its proper divisors (68913525).

206740563 is an equidigital number, since it uses as much as digits as its factorization.

206740563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68913524.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 206740563 is about 14378.4756841607. The cubic root of 206740563 is about 591.3009338305.

The spelling of 206740563 in words is "two hundred six million, seven hundred forty thousand, five hundred sixty-three".