20516411 has 4 divisors (see below), whose sum is σ = 20525472. Its totient is φ = 20507352.

The previous prime is 20516387. The next prime is 20516417. The reversal of 20516411 is 11461502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20516411 - 2¹⁴ = 20500027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20516417) 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, 2165 + ... + 6761.

It is an arithmetic number, because the mean of its divisors is an integer number (5131368).

Almost surely, 2^20516411 is an apocalyptic number.

20516411 is a deficient number, since it is larger than the sum of its proper divisors (9061).

20516411 is an equidigital number, since it uses as much as digits as its factorization.

20516411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9060.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 20516411 is about 4529.5044982868. The cubic root of 20516411 is about 273.7581959279.

Adding to 20516411 its reverse (11461502), we get a palindrome (31977913).

The spelling of 20516411 in words is "twenty million, five hundred sixteen thousand, four hundred eleven".