18520449120 has 672 divisors, whose sum is σ = 70698912480. Its totient is φ = 4568555520.

The previous prime is 18520449119. The next prime is 18520449163. The reversal of 18520449120 is 2194402581.

18520449120 is a `hidden beast` number, since 1 + 8 + 520 + 4 + 4 + 9 + 120 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 135185692 + ... + 135185828.

It is an arithmetic number, because the mean of its divisors is an integer number (105206715).

Almost surely, 2^18520449120 is an apocalyptic number.

18520449120 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 18520449120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35349456240).

18520449120 is an abundant number, since it is smaller than the sum of its proper divisors (52178463360).

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

18520449120 is a wasteful number, since it uses less digits than its factorization.

18520449120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 18520449120 in words is "eighteen billion, five hundred twenty million, four hundred forty-nine thousand, one hundred twenty".