20644044446 has 4 divisors (see below), whose sum is σ = 30966066672. Its totient is φ = 10322022222.

The previous prime is 20644044433. The next prime is 20644044479. The reversal of 20644044446 is 64444044602.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5161011110 + ... + 5161011113.

It is an arithmetic number, because the mean of its divisors is an integer number (7741516668).

Almost surely, 2^20644044446 is an apocalyptic number.

20644044446 is a deficient number, since it is larger than the sum of its proper divisors (10322022226).

20644044446 is a wasteful number, since it uses less digits than its factorization.

20644044446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10322022225.

The product of its (nonzero) digits is 294912, while the sum is 38.

The spelling of 20644044446 in words is "twenty billion, six hundred forty-four million, forty-four thousand, four hundred forty-six".