20944307638 has 16 divisors (see below), whose sum is σ = 31466159424. Its totient is φ = 10455602560.

The previous prime is 20944307617. The next prime is 20944307647. The reversal of 20944307638 is 83670344902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6145731 + ... + 6149137.

It is an arithmetic number, because the mean of its divisors is an integer number (1966634964).

Almost surely, 2^20944307638 is an apocalyptic number.

20944307638 is a deficient number, since it is larger than the sum of its proper divisors (10521851786).

20944307638 is a wasteful number, since it uses less digits than its factorization.

20944307638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 20944307638 in words is "twenty billion, nine hundred forty-four million, three hundred seven thousand, six hundred thirty-eight".