2019110091920 has 20 divisors (see below), whose sum is σ = 4694430963900. Its totient is φ = 807644036736.

The previous prime is 2019110091899. The next prime is 2019110091949. The reversal of 2019110091920 is 291900119102.

It can be written as a sum of positive squares in 2 ways, for example, as 596156940544 + 1422953151376 = 772112^2 + 1192876^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 12619437995 + ... + 12619438154.

It is an arithmetic number, because the mean of its divisors is an integer number (234721548195).

Almost surely, 2^{2019110091920} is an apocalyptic number.

2019110091920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2019110091920 is an abundant number, since it is smaller than the sum of its proper divisors (2675320871980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2019110091920 is a wasteful number, since it uses less digits than its factorization.

2019110091920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25238876162 (or 25238876156 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 2019110091920 in words is "two trillion, nineteen billion, one hundred ten million, ninety-one thousand, nine hundred twenty".