20644660444 has 12 divisors (see below), whose sum is σ = 38029637800. Its totient is φ = 9779049648.

The previous prime is 20644660429. The next prime is 20644660471. The reversal of 20644660444 is 44406644602.

It is a happy number.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 20644660397 and 20644660406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135820059 + ... + 135820210.

Almost surely, 2^20644660444 is an apocalyptic number.

It is an amenable number.

20644660444 is a deficient number, since it is larger than the sum of its proper divisors (17384977356).

20644660444 is a wasteful number, since it uses less digits than its factorization.

20644660444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271640292 (or 271640290 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 40.

The spelling of 20644660444 in words is "twenty billion, six hundred forty-four million, six hundred sixty thousand, four hundred forty-four".