205320931 has 8 divisors (see below), whose sum is σ = 215792640. Its totient is φ = 194977992.

The previous prime is 205320923. The next prime is 205320949. The reversal of 205320931 is 139023502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205320931 - 2³ = 205320923 is a prime.

It is a super-4 number, since 4×205320931⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205320896 and 205320905.

It is not an unprimeable number, because it can be changed into a prime (205320901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28915 + ... + 35308.

It is an arithmetic number, because the mean of its divisors is an integer number (26974080).

Almost surely, 2^205320931 is an apocalyptic number.

205320931 is a deficient number, since it is larger than the sum of its proper divisors (10471709).

205320931 is a wasteful number, since it uses less digits than its factorization.

205320931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64385.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 205320931 is about 14329.0240770263. The cubic root of 205320931 is about 589.9443890896.

The spelling of 205320931 in words is "two hundred five million, three hundred twenty thousand, nine hundred thirty-one".