20411311 has 4 divisors (see below), whose sum is σ = 20690992. Its totient is φ = 20131632.

The previous prime is 20411291. The next prime is 20411323. The reversal of 20411311 is 11311402.

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 20411311 - 2⁹ = 20410799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20411291 and 20411300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20411341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139731 + ... + 139876.

It is an arithmetic number, because the mean of its divisors is an integer number (5172748).

Almost surely, 2^20411311 is an apocalyptic number.

20411311 is a deficient number, since it is larger than the sum of its proper divisors (279681).

20411311 is an equidigital number, since it uses as much as digits as its factorization.

20411311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279680.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20411311 is about 4517.8878914820. The cubic root of 20411311 is about 273.2899324639.

Adding to 20411311 its reverse (11311402), we get a palindrome (31722713).

Subtracting from 20411311 its reverse (11311402), we obtain a palindrome (9099909).

The spelling of 20411311 in words is "twenty million, four hundred eleven thousand, three hundred eleven".