205208645 has 24 divisors (see below), whose sum is σ = 271247616. Its totient is φ = 148734432.

The previous prime is 205208639. The next prime is 205208657. The reversal of 205208645 is 546802502.

205208645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205208645 - 2²⁶ = 138099781 is a prime.

It is a super-2 number, since 2×205208645² = 84221175965472050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39044 + ... + 43986.

It is an arithmetic number, because the mean of its divisors is an integer number (11301984).

Almost surely, 2^205208645 is an apocalyptic number.

It is an amenable number.

205208645 is a deficient number, since it is larger than the sum of its proper divisors (66038971).

205208645 is a wasteful number, since it uses less digits than its factorization.

205208645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009 (or 4990 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 205208645 is about 14325.1054097343. The cubic root of 205208645 is about 589.8368264646.

The spelling of 205208645 in words is "two hundred five million, two hundred eight thousand, six hundred forty-five".