19120120020 has 36 divisors (see below), whose sum is σ = 57997697940. Its totient is φ = 5098698624.

The previous prime is 19120119973. The next prime is 19120120039. The reversal of 19120120020 is 2002102191.

It can be written as a sum of positive squares in 2 ways, for example, as 4562732304 + 14557387716 = 67548^2 + 120654^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 19120119975 and 19120120002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53111265 + ... + 53111624.

It is an arithmetic number, because the mean of its divisors is an integer number (1611047165).

Almost surely, 2^19120120020 is an apocalyptic number.

19120120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19120120020 is an abundant number, since it is smaller than the sum of its proper divisors (38877577920).

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

19120120020 is a wasteful number, since it uses less digits than its factorization.

19120120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106222904 (or 106222899 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 19120120020 in words is "nineteen billion, one hundred twenty million, one hundred twenty thousand, twenty".