18500425920 has 504 divisors, whose sum is σ = 68254162704. Its totient is φ = 4768118784.

The previous prime is 18500425883. The next prime is 18500425921. The reversal of 18500425920 is 2952400581.

18500425920 is a `hidden beast` number, since 18 + 50 + 0 + 4 + 2 + 592 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (18500425921) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 276125727 + ... + 276125793.

It is an arithmetic number, because the mean of its divisors is an integer number (135424926).

Almost surely, 2^18500425920 is an apocalyptic number.

18500425920 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 18500425920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34127081352).

18500425920 is an abundant number, since it is smaller than the sum of its proper divisors (49753736784).

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

18500425920 is an frugal number, since it uses more digits than its factorization.

18500425920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 18500425920 in words is "eighteen billion, five hundred million, four hundred twenty-five thousand, nine hundred twenty".