20044909991779 has 16 divisors (see below), whose sum is σ = 20173274726400. Its totient is φ = 19916973254080.

The previous prime is 20044909991707. The next prime is 20044909991783. The reversal of 20044909991779 is 97719990944002.

It is a cyclic number.

It is not a de Polignac number, because 20044909991779 - 2¹⁹ = 20044909467491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20044909991879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 548751414 + ... + 548787940.

It is an arithmetic number, because the mean of its divisors is an integer number (1260829670400).

Almost surely, 2^{20044909991779} is an apocalyptic number.

20044909991779 is a deficient number, since it is larger than the sum of its proper divisors (128364734621).

20044909991779 is a wasteful number, since it uses less digits than its factorization.

20044909991779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42290.

The product of its (nonzero) digits is 92588832, while the sum is 70.

The spelling of 20044909991779 in words is "twenty trillion, forty-four billion, nine hundred nine million, nine hundred ninety-one thousand, seven hundred seventy-nine".