199831420920 has 128 divisors (see below), whose sum is σ = 618313098240. Its totient is φ = 51638054400.

The previous prime is 199831420889. The next prime is 199831420951. The reversal of 199831420920 is 29024138991.

199831420920 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (199831420889) and next prime (199831420951).

It is a self number, because there is not a number n which added to its sum of digits gives 199831420920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394239 + ... + 745041.

It is an arithmetic number, because the mean of its divisors is an integer number (4830571080).

Almost surely, 2^199831420920 is an apocalyptic number.

199831420920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199831420920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309156549120).

199831420920 is an abundant number, since it is smaller than the sum of its proper divisors (418481677320).

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

199831420920 is a wasteful number, since it uses less digits than its factorization.

199831420920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350965 (or 350961 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 199831420920 in words is "one hundred ninety-nine billion, eight hundred thirty-one million, four hundred twenty thousand, nine hundred twenty".