18202021824 has 112 divisors (see below), whose sum is σ = 55107157248. Its totient is φ = 5194180608.

The previous prime is 18202021813. The next prime is 18202021843. The reversal of 18202021824 is 42812020281.

It is a tau number, because it is divible by the number of its divisors (112).

It is a junction number, because it is equal to n+sod(n) for n = 18202021791 and 18202021800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1143907 + ... + 1159709.

Almost surely, 2^18202021824 is an apocalyptic number.

18202021824 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18202021824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27553578624).

18202021824 is an abundant number, since it is smaller than the sum of its proper divisors (36905135424).

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

18202021824 is a wasteful number, since it uses less digits than its factorization.

18202021824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16682 (or 16672 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The spelling of 18202021824 in words is "eighteen billion, two hundred two million, twenty-one thousand, eight hundred twenty-four".