20811027 has 4 divisors (see below), whose sum is σ = 27748040. Its totient is φ = 13874016.

The previous prime is 20811019. The next prime is 20811031. The reversal of 20811027 is 72011802.

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

It is not a de Polignac number, because 20811027 - 2³ = 20811019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20810994 and 20811012.

It is not an unprimeable number, because it can be changed into a prime (20811127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3468502 + ... + 3468507.

It is an arithmetic number, because the mean of its divisors is an integer number (6937010).

Almost surely, 2^20811027 is an apocalyptic number.

20811027 is a deficient number, since it is larger than the sum of its proper divisors (6937013).

20811027 is an equidigital number, since it uses as much as digits as its factorization.

20811027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6937012.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20811027 is about 4561.9104550616. The cubic root of 20811027 is about 275.0623638177.

Adding to 20811027 its reverse (72011802), we get a palindrome (92822829).

The spelling of 20811027 in words is "twenty million, eight hundred eleven thousand, twenty-seven".