20566455203 has 4 divisors (see below), whose sum is σ = 23504520240. Its totient is φ = 17628390168.

The previous prime is 20566455197. The next prime is 20566455223. The reversal of 20566455203 is 30255466502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30255466502 = 2 ⋅15127733251.

It is a cyclic number.

It is not a de Polignac number, because 20566455203 - 2⁴ = 20566455187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20566455223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1469032508 + ... + 1469032521.

It is an arithmetic number, because the mean of its divisors is an integer number (5876130060).

Almost surely, 2^20566455203 is an apocalyptic number.

20566455203 is a deficient number, since it is larger than the sum of its proper divisors (2938065037).

20566455203 is an equidigital number, since it uses as much as digits as its factorization.

20566455203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938065036.

The product of its (nonzero) digits is 216000, while the sum is 38.

The spelling of 20566455203 in words is "twenty billion, five hundred sixty-six million, four hundred fifty-five thousand, two hundred three".