19181910020 has 48 divisors (see below), whose sum is σ = 49577864448. Its totient is φ = 6070757760.

The previous prime is 19181909993. The next prime is 19181910061. The reversal of 19181910020 is 2001918191.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5267936 + ... + 5271575.

It is an arithmetic number, because the mean of its divisors is an integer number (1032872176).

Almost surely, 2^19181910020 is an apocalyptic number.

19181910020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19181910020 is an abundant number, since it is smaller than the sum of its proper divisors (30395954428).

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

19181910020 is a wasteful number, since it uses less digits than its factorization.

19181910020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10539540 (or 10539538 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 19181910020 in words is "nineteen billion, one hundred eighty-one million, nine hundred ten thousand, twenty".