205000011 has 16 divisors (see below), whose sum is σ = 305748000. Its totient is φ = 135746784.

The previous prime is 205000007. The next prime is 205000013. The reversal of 205000011 is 110000502.

It is a happy number.

It is not a de Polignac number, because 205000011 - 2² = 205000007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 204999957 and 205000002.

It is not an unprimeable number, because it can be changed into a prime (205000013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21456 + ... + 29501.

It is an arithmetic number, because the mean of its divisors is an integer number (19109250).

Almost surely, 2^205000011 is an apocalyptic number.

205000011 is a deficient number, since it is larger than the sum of its proper divisors (100747989).

205000011 is a wasteful number, since it uses less digits than its factorization.

205000011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51115 (or 51109 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 205000011 is about 14317.8214474130. The cubic root of 205000011 is about 589.6368645434.

Adding to 205000011 its reverse (110000502), we get a palindrome (315000513).

The spelling of 205000011 in words is "two hundred five million, eleven", and thus it is an aban number.