205740307 has 4 divisors (see below), whose sum is σ = 217842696. Its totient is φ = 193637920.

The previous prime is 205740289. The next prime is 205740319. The reversal of 205740307 is 703047502.

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 205740307 - 2¹⁹ = 205216019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205740107) 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, 6051169 + ... + 6051202.

It is an arithmetic number, because the mean of its divisors is an integer number (54460674).

Almost surely, 2^205740307 is an apocalyptic number.

205740307 is a deficient number, since it is larger than the sum of its proper divisors (12102389).

205740307 is a wasteful number, since it uses less digits than its factorization.

205740307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12102388.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 205740307 is about 14343.6504070617. The cubic root of 205740307 is about 590.3457773953.

Adding to 205740307 its reverse (703047502), we get a palindrome (908787809).

The spelling of 205740307 in words is "two hundred five million, seven hundred forty thousand, three hundred seven".