18511045020 has 336 divisors, whose sum is σ = 63342935040. Its totient is φ = 4514807808.

The previous prime is 18511044991. The next prime is 18511045061. The reversal of 18511045020 is 2054011581.

18511045020 is a `hidden beast` number, since 1 + 8 + 51 + 104 + 502 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 24071196 + ... + 24071964.

It is an arithmetic number, because the mean of its divisors is an integer number (188520640).

Almost surely, 2^18511045020 is an apocalyptic number.

18511045020 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 18511045020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31671467520).

18511045020 is an abundant number, since it is smaller than the sum of its proper divisors (44831890020).

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

18511045020 is a wasteful number, since it uses less digits than its factorization.

18511045020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 919 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The spelling of 18511045020 in words is "eighteen billion, five hundred eleven million, forty-five thousand, twenty".