205023387 has 4 divisors (see below), whose sum is σ = 273364520. Its totient is φ = 136682256.

The previous prime is 205023341. The next prime is 205023391. The reversal of 205023387 is 783320502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 205023387 - 2⁸ = 205023131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205023307) 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, 34170562 + ... + 34170567.

It is an arithmetic number, because the mean of its divisors is an integer number (68341130).

Almost surely, 2^205023387 is an apocalyptic number.

205023387 is a deficient number, since it is larger than the sum of its proper divisors (68341133).

205023387 is an equidigital number, since it uses as much as digits as its factorization.

205023387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68341132.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 205023387 is about 14318.6377494509. The cubic root of 205023387 is about 589.6592756438.

Adding to 205023387 its reverse (783320502), we get a palindrome (988343889).

The spelling of 205023387 in words is "two hundred five million, twenty-three thousand, three hundred eighty-seven".