19919938850 has 24 divisors (see below), whose sum is σ = 42344099328. Its totient is φ = 6829693200.

The previous prime is 19919938799. The next prime is 19919938861. The reversal of 19919938850 is 5883991991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28456706 + ... + 28457405.

It is an arithmetic number, because the mean of its divisors is an integer number (1764337472).

Almost surely, 2^19919938850 is an apocalyptic number.

19919938850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19919938850 is an abundant number, since it is smaller than the sum of its proper divisors (22424160478).

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

19919938850 is a wasteful number, since it uses less digits than its factorization.

19919938850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56914130 (or 56914125 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 62.

The spelling of 19919938850 in words is "nineteen billion, nine hundred nineteen million, nine hundred thirty-eight thousand, eight hundred fifty".