19804313771 has 16 divisors (see below), whose sum is σ = 21715872768. Its totient is φ = 17911404000.

The previous prime is 19804313729. The next prime is 19804313779. The reversal of 19804313771 is 17731340891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19804313771 - 2⁶ = 19804313707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19804313779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5349221 + ... + 5352921.

It is an arithmetic number, because the mean of its divisors is an integer number (1357242048).

Almost surely, 2^19804313771 is an apocalyptic number.

19804313771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19804313771 is a deficient number, since it is larger than the sum of its proper divisors (1911558997).

19804313771 is a wasteful number, since it uses less digits than its factorization.

19804313771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6082.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 19804313771 in words is "nineteen billion, eight hundred four million, three hundred thirteen thousand, seven hundred seventy-one".