20816417 has 4 divisors (see below), whose sum is σ = 20842416. Its totient is φ = 20790420.

The previous prime is 20816413. The next prime is 20816437. The reversal of 20816417 is 71461802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20816417 - 2² = 20816413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20816417.

It is not an unprimeable number, because it can be changed into a prime (20816413) 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 in 3 ways as a sum of consecutive naturals, for example, 11759 + ... + 13412.

It is an arithmetic number, because the mean of its divisors is an integer number (5210604).

Almost surely, 2^20816417 is an apocalyptic number.

It is an amenable number.

20816417 is a deficient number, since it is larger than the sum of its proper divisors (25999).

20816417 is an equidigital number, since it uses as much as digits as its factorization.

20816417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25998.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20816417 is about 4562.5011780820. The cubic root of 20816417 is about 275.0861085719.

The spelling of 20816417 in words is "twenty million, eight hundred sixteen thousand, four hundred seventeen".