20080111 has 4 divisors (see below), whose sum is σ = 21261312. Its totient is φ = 18898912.

The previous prime is 20080103. The next prime is 20080117. The reversal of 20080111 is 11108002.

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

It is a cyclic number.

It is not a de Polignac number, because 20080111 - 2³ = 20080103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20080091 and 20080100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20080117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590575 + ... + 590608.

It is an arithmetic number, because the mean of its divisors is an integer number (5315328).

Almost surely, 2^20080111 is an apocalyptic number.

20080111 is a deficient number, since it is larger than the sum of its proper divisors (1181201).

20080111 is a wasteful number, since it uses less digits than its factorization.

20080111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181200.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 20080111 is about 4481.0836858956. The cubic root of 20080111 is about 271.8037033464.

Adding to 20080111 its reverse (11108002), we get a palindrome (31188113).

The spelling of 20080111 in words is "twenty million, eighty thousand, one hundred eleven".