19119391820 has 48 divisors (see below), whose sum is σ = 42289763040. Its totient is φ = 7240813056.

The previous prime is 19119391813. The next prime is 19119391843. The reversal of 19119391820 is 2819391191.

It is a super-2 number, since 2×19119391820² (a number of 21 digits) contains 22 as substring.

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, 644024 + ... + 673056.

It is an arithmetic number, because the mean of its divisors is an integer number (881036730).

Almost surely, 2^19119391820 is an apocalyptic number.

19119391820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19119391820 is an abundant number, since it is smaller than the sum of its proper divisors (23170371220).

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

19119391820 is a wasteful number, since it uses less digits than its factorization.

19119391820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30794 (or 30792 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 44.

The spelling of 19119391820 in words is "nineteen billion, one hundred nineteen million, three hundred ninety-one thousand, eight hundred twenty".