18306743820 has 48 divisors (see below), whose sum is σ = 52644264288. Its totient is φ = 4749857280.

The previous prime is 18306743797. The next prime is 18306743821. The reversal of 18306743820 is 2834760381.

It is a super-2 number, since 2×18306743820² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18306743821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4120921 + ... + 4125360.

It is an arithmetic number, because the mean of its divisors is an integer number (1096755506).

Almost surely, 2^18306743820 is an apocalyptic number.

18306743820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18306743820 is an abundant number, since it is smaller than the sum of its proper divisors (34337520468).

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

18306743820 is a wasteful number, since it uses less digits than its factorization.

18306743820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8246330 (or 8246328 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 18306743820 in words is "eighteen billion, three hundred six million, seven hundred forty-three thousand, eight hundred twenty".