20566201 has 4 divisors (see below), whose sum is σ = 20614132. Its totient is φ = 20518272.

The previous prime is 20566193. The next prime is 20566241. The reversal of 20566201 is 10266502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11048976 + 9517225 = 3324^2 + 3085^2 .

It is a cyclic number.

It is not a de Polignac number, because 20566201 - 2³ = 20566193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20566241) 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, 23316 + ... + 24181.

It is an arithmetic number, because the mean of its divisors is an integer number (5153533).

Almost surely, 2^20566201 is an apocalyptic number.

It is an amenable number.

20566201 is a deficient number, since it is larger than the sum of its proper divisors (47931).

20566201 is an equidigital number, since it uses as much as digits as its factorization.

20566201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47930.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20566201 is about 4534.9973539132. The cubic root of 20566201 is about 273.9794725951.

The spelling of 20566201 in words is "twenty million, five hundred sixty-six thousand, two hundred one".