20050811 has 8 divisors (see below), whose sum is σ = 22339584. Its totient is φ = 17839720.

The previous prime is 20050799. The next prime is 20050813. The reversal of 20050811 is 11805002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20050811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20050811.

It is not an unprimeable number, because it can be changed into a prime (20050813) 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, 18875 + ... + 19908.

It is an arithmetic number, because the mean of its divisors is an integer number (2792448).

Almost surely, 2^20050811 is an apocalyptic number.

20050811 is a deficient number, since it is larger than the sum of its proper divisors (2288773).

20050811 is a wasteful number, since it uses less digits than its factorization.

20050811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38841.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 20050811 is about 4477.8131939597. The cubic root of 20050811 is about 271.6714377238.

Adding to 20050811 its reverse (11805002), we get a palindrome (31855813).

The spelling of 20050811 in words is "twenty million, fifty thousand, eight hundred eleven".