18236284920 has 336 divisors, whose sum is σ = 71568896760. Its totient is φ = 4167967104.

The previous prime is 18236284879. The next prime is 18236284981. The reversal of 18236284920 is 2948263281.

18236284920 is a `hidden beast` number, since 18 + 2 + 3 + 628 + 4 + 9 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 1422459 + ... + 1435221.

Almost surely, 2^18236284920 is an apocalyptic number.

18236284920 is a gapful number since it is divisible by the number (10) 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 18236284920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35784448380).

18236284920 is an abundant number, since it is smaller than the sum of its proper divisors (53332611840).

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

18236284920 is a wasteful number, since it uses less digits than its factorization.

18236284920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12806 (or 12780 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 18236284920 in words is "eighteen billion, two hundred thirty-six million, two hundred eighty-four thousand, nine hundred twenty".