19820840094 has 72 divisors (see below), whose sum is σ = 47868315768. Its totient is φ = 5878391520.

The previous prime is 19820840063. The next prime is 19820840189. The reversal of 19820840094 is 49004802891.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 414724 + ... + 460040.

It is an arithmetic number, because the mean of its divisors is an integer number (664837719).

Almost surely, 2^19820840094 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19820840094, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23934157884).

19820840094 is an abundant number, since it is smaller than the sum of its proper divisors (28047475674).

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

19820840094 is a wasteful number, since it uses less digits than its factorization.

19820840094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45430 (or 45380 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 19820840094 in words is "nineteen billion, eight hundred twenty million, eight hundred forty thousand, ninety-four".