20411 has 2 divisors, whose sum is σ = 20412. Its totient is φ = 20410.

The previous prime is 20407. The next prime is 20431. The reversal of 20411 is 11402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20411 - 2² = 20407 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 7.

It is not a weakly prime, because it can be changed into another prime (20431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10205 + 10206.

It is an arithmetic number, because the mean of its divisors is an integer number (10206).

2²⁰⁴¹¹ is an apocalyptic number.

20411 is a deficient number, since it is larger than the sum of its proper divisors (1).

20411 is an equidigital number, since it uses as much as digits as its factorization.

20411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20411 is about 142.8670710836. The cubic root of 20411 is about 27.3288544449.

Adding to 20411 its reverse (11402), we get a palindrome (31813).

Subtracting from 20411 its reverse (11402), we obtain a palindrome (9009).

The spelling of 20411 in words is "twenty thousand, four hundred eleven", and thus it is an iban number.