205420011 has 8 divisors (see below), whose sum is σ = 274091520. Its totient is φ = 136847592.

The previous prime is 205420003. The next prime is 205420031. The reversal of 205420011 is 110024502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205420011 - 2³ = 205420003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205420031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19791 + ... + 28328.

It is an arithmetic number, because the mean of its divisors is an integer number (34261440).

Almost surely, 2^205420011 is an apocalyptic number.

205420011 is a deficient number, since it is larger than the sum of its proper divisors (68671509).

205420011 is a wasteful number, since it uses less digits than its factorization.

205420011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49545.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 205420011 is about 14332.4809785326. The cubic root of 205420011 is about 590.0392686685.

Adding to 205420011 its reverse (110024502), we get a palindrome (315444513).

The spelling of 205420011 in words is "two hundred five million, four hundred twenty thousand, eleven".