20566417 has 4 divisors (see below), whose sum is σ = 21648880. Its totient is φ = 19483956.

The previous prime is 20566409. The next prime is 20566453. The reversal of 20566417 is 71466502.

It is a happy number.

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 20566417 - 2³ = 20566409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20566817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541203 + ... + 541240.

It is an arithmetic number, because the mean of its divisors is an integer number (5412220).

Almost surely, 2^20566417 is an apocalyptic number.

It is an amenable number.

20566417 is a deficient number, since it is larger than the sum of its proper divisors (1082463).

20566417 is a wasteful number, since it uses less digits than its factorization.

20566417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082462.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20566417 is about 4535.0211686386. The cubic root of 20566417 is about 273.9804317636.

The spelling of 20566417 in words is "twenty million, five hundred sixty-six thousand, four hundred seventeen".