20811103 has 2 divisors, whose sum is σ = 20811104. Its totient is φ = 20811102.

The previous prime is 20811101. The next prime is 20811121. The reversal of 20811103 is 30111802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20811103 - 2¹ = 20811101 is a prime.

Together with 20811101, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20811101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10405551 + 10405552.

It is an arithmetic number, because the mean of its divisors is an integer number (10405552).

Almost surely, 2^20811103 is an apocalyptic number.

20811103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20811103 is an equidigital number, since it uses as much as digits as its factorization.

20811103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 20811103 is about 4561.9187848974. The cubic root of 20811103 is about 275.0626986516.

Adding to 20811103 its reverse (30111802), we get a palindrome (50922905).

It can be divided in two parts, 208 and 11103, that added together give a palindrome (11311).

The spelling of 20811103 in words is "twenty million, eight hundred eleven thousand, one hundred three".