18019820020 has 24 divisors (see below), whose sum is σ = 39833287200. Its totient is φ = 6828563232.

The previous prime is 18019820017. The next prime is 18019820023. The reversal of 18019820020 is 2002891081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18019820017) and next prime (18019820023).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019820023) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23709910 + ... + 23710669.

It is an arithmetic number, because the mean of its divisors is an integer number (1659720300).

Almost surely, 2^18019820020 is an apocalyptic number.

18019820020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18019820020 is an abundant number, since it is smaller than the sum of its proper divisors (21813467180).

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

18019820020 is a wasteful number, since it uses less digits than its factorization.

18019820020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47420607 (or 47420605 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 18019820020 in words is "eighteen billion, nineteen million, eight hundred twenty thousand, twenty".