18939829920 has 144 divisors (see below), whose sum is σ = 65577405600. Its totient is φ = 4591459840.

The previous prime is 18939829919. The next prime is 18939829939. The reversal of 18939829920 is 2992893981.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104970 + ... + 221129.

It is an arithmetic number, because the mean of its divisors is an integer number (455398650).

Almost surely, 2^18939829920 is an apocalyptic number.

18939829920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18939829920 is an abundant number, since it is smaller than the sum of its proper divisors (46637575680).

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

18939829920 is a wasteful number, since it uses less digits than its factorization.

18939829920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326139 (or 326120 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 60.

The spelling of 18939829920 in words is "eighteen billion, nine hundred thirty-nine million, eight hundred twenty-nine thousand, nine hundred twenty".