205506673 has 4 divisors (see below), whose sum is σ = 212593140. Its totient is φ = 198420208.

The previous prime is 205506671. The next prime is 205506677. The reversal of 205506673 is 376605502.

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 157176369 + 48330304 = 12537^2 + 6952^2 .

It is a cyclic number.

It is not a de Polignac number, because 205506673 - 2¹ = 205506671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205506671) 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, 3543190 + ... + 3543247.

It is an arithmetic number, because the mean of its divisors is an integer number (53148285).

Almost surely, 2^205506673 is an apocalyptic number.

It is an amenable number.

205506673 is a deficient number, since it is larger than the sum of its proper divisors (7086467).

205506673 is an equidigital number, since it uses as much as digits as its factorization.

205506673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7086466.

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 205506673 is about 14335.5039325445. The cubic root of 205506673 is about 590.1222316895.

The spelling of 205506673 in words is "two hundred five million, five hundred six thousand, six hundred seventy-three".