18804564720 has 240 divisors, whose sum is σ = 67091143392. Its totient is φ = 4892037120.

The previous prime is 18804564719. The next prime is 18804564731. The reversal of 18804564720 is 2746540881.

18804564720 is a `hidden beast` number, since 1 + 8 + 80 + 4 + 564 + 7 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×18804564720² (a number of 21 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 785244 + ... + 808836.

Almost surely, 2^18804564720 is an apocalyptic number.

18804564720 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 18804564720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33545571696).

18804564720 is an abundant number, since it is smaller than the sum of its proper divisors (48286578672).

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

18804564720 is a wasteful number, since it uses less digits than its factorization.

18804564720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23662 (or 23644 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 18804564720 in words is "eighteen billion, eight hundred four million, five hundred sixty-four thousand, seven hundred twenty".