19818836920 has 64 divisors (see below), whose sum is σ = 48453580800. Its totient is φ = 7268019840.

The previous prime is 19818836909. The next prime is 19818836927. The reversal of 19818836920 is 2963881891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19818836927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397044 + ... + 444163.

It is an arithmetic number, because the mean of its divisors is an integer number (757087200).

Almost surely, 2^19818836920 is an apocalyptic number.

19818836920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19818836920 is an abundant number, since it is smaller than the sum of its proper divisors (28634743880).

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

19818836920 is a wasteful number, since it uses less digits than its factorization.

19818836920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841268 (or 841264 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 19818836920 in words is "nineteen billion, eight hundred eighteen million, eight hundred thirty-six thousand, nine hundred twenty".