20644660201 has 4 divisors (see below), whose sum is σ = 22521447504. Its totient is φ = 18767872900.

The previous prime is 20644660151. The next prime is 20644660213. The reversal of 20644660201 is 10206644602.

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 a de Polignac number, because none of the positive numbers 2^k-20644660201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20644660261) 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, 938393635 + ... + 938393656.

It is an arithmetic number, because the mean of its divisors is an integer number (5630361876).

Almost surely, 2^20644660201 is an apocalyptic number.

It is an amenable number.

20644660201 is a deficient number, since it is larger than the sum of its proper divisors (1876787303).

20644660201 is a wasteful number, since it uses less digits than its factorization.

20644660201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876787302.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 20644660201 in words is "twenty billion, six hundred forty-four million, six hundred sixty thousand, two hundred one".