18920919020 has 12 divisors (see below), whose sum is σ = 39733929984. Its totient is φ = 7568367600.

The previous prime is 18920919001. The next prime is 18920919077. The reversal of 18920919020 is 2091902981.

It is a super-2 number, since 2×18920919020² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473022956 + ... + 473022995.

It is an arithmetic number, because the mean of its divisors is an integer number (3311160832).

Almost surely, 2^18920919020 is an apocalyptic number.

18920919020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18920919020 is an abundant number, since it is smaller than the sum of its proper divisors (20813010964).

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

18920919020 is a wasteful number, since it uses less digits than its factorization.

18920919020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946045960 (or 946045958 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 18920919020 in words is "eighteen billion, nine hundred twenty million, nine hundred nineteen thousand, twenty".