20644406206 has 8 divisors (see below), whose sum is σ = 30967268184. Its totient is φ = 10321983480.

The previous prime is 20644406203. The next prime is 20644406207. The reversal of 20644406206 is 60260444602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644406203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60541 + ... + 212023.

It is an arithmetic number, because the mean of its divisors is an integer number (3870908523).

Almost surely, 2^20644406206 is an apocalyptic number.

20644406206 is a deficient number, since it is larger than the sum of its proper divisors (10322861978).

20644406206 is a wasteful number, since it uses less digits than its factorization.

20644406206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219626.

The product of its (nonzero) digits is 55296, while the sum is 34.

The spelling of 20644406206 in words is "twenty billion, six hundred forty-four million, four hundred six thousand, two hundred six".