19840398020 has 48 divisors (see below), whose sum is σ = 42489171648. Its totient is φ = 7780606080.

The previous prime is 19840398007. The next prime is 19840398031. The reversal of 19840398020 is 2089304891.

It is a happy number.

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, 171842 + ... + 263078.

It is an arithmetic number, because the mean of its divisors is an integer number (885191076).

Almost surely, 2^19840398020 is an apocalyptic number.

19840398020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19840398020 is an abundant number, since it is smaller than the sum of its proper divisors (22648773628).

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

19840398020 is a wasteful number, since it uses less digits than its factorization.

19840398020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91460 (or 91458 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 19840398020 in words is "nineteen billion, eight hundred forty million, three hundred ninety-eight thousand, twenty".