205001023 has 4 divisors (see below), whose sum is σ = 206306920. Its totient is φ = 203695128.

The previous prime is 205000997. The next prime is 205001033. The reversal of 205001023 is 320100502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320100502 = 2 ⋅160050251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205001023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205000994 and 205001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205001033) 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, 652713 + ... + 653026.

It is an arithmetic number, because the mean of its divisors is an integer number (51576730).

Almost surely, 2^205001023 is an apocalyptic number.

205001023 is a deficient number, since it is larger than the sum of its proper divisors (1305897).

205001023 is a wasteful number, since it uses less digits than its factorization.

205001023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305896.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 205001023 is about 14317.8567879414. The cubic root of 205001023 is about 589.6378348060.

Adding to 205001023 its reverse (320100502), we get a palindrome (525101525).

The spelling of 205001023 in words is "two hundred five million, one thousand, twenty-three".