18983994420 has 24 divisors (see below), whose sum is σ = 53155184544. Its totient is φ = 5062398496.

The previous prime is 18983994409. The next prime is 18983994437. The reversal of 18983994420 is 2449938981.

It is a super-2 number, since 2×18983994420² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158199894 + ... + 158200013.

It is an arithmetic number, because the mean of its divisors is an integer number (2214799356).

Almost surely, 2^18983994420 is an apocalyptic number.

18983994420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18983994420 is an abundant number, since it is smaller than the sum of its proper divisors (34171190124).

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

18983994420 is a wasteful number, since it uses less digits than its factorization.

18983994420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316399919 (or 316399917 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 57.

The spelling of 18983994420 in words is "eighteen billion, nine hundred eighty-three million, nine hundred ninety-four thousand, four hundred twenty".