19837981836 has 120 divisors (see below), whose sum is σ = 54975246480. Its totient is φ = 6216403968.

The previous prime is 19837981829. The next prime is 19837981841. The reversal of 19837981836 is 63818973891.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6569535 + ... + 6572553.

It is an arithmetic number, because the mean of its divisors is an integer number (458127054).

Almost surely, 2^19837981836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19837981836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27487623240).

19837981836 is an abundant number, since it is smaller than the sum of its proper divisors (35137264644).

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

19837981836 is a wasteful number, since it uses less digits than its factorization.

19837981836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245 (or 4234 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The spelling of 19837981836 in words is "nineteen billion, eight hundred thirty-seven million, nine hundred eighty-one thousand, eight hundred thirty-six".