20044019977 has 4 divisors (see below), whose sum is σ = 20044767616. Its totient is φ = 20043272340.

The previous prime is 20044019971. The next prime is 20044020049. The reversal of 20044019977 is 77991044002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77991044002 = 2 ⋅38995522001.

It is a cyclic number.

It is not a de Polignac number, because 20044019977 - 2²⁷ = 19909802249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20044019971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332049 + ... + 387742.

It is an arithmetic number, because the mean of its divisors is an integer number (5011191904).

Almost surely, 2^20044019977 is an apocalyptic number.

It is an amenable number.

20044019977 is a deficient number, since it is larger than the sum of its proper divisors (747639).

20044019977 is an equidigital number, since it uses as much as digits as its factorization.

20044019977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747638.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 20044019977 in words is "twenty billion, forty-four million, nineteen thousand, nine hundred seventy-seven".