18044846820 has 1152 divisors, whose sum is σ = 81081907200. Its totient is φ = 3265920000.

The previous prime is 18044846791. The next prime is 18044846851. The reversal of 18044846820 is 2864844081.

18044846820 is a `hidden beast` number, since 180 + 4 + 4 + 8 + 468 + 2 + 0 = 666.

It is a super-2 number, since 2×18044846820² (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 an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 71891695 + ... + 71891945.

It is an arithmetic number, because the mean of its divisors is an integer number (70383600).

Almost surely, 2^18044846820 is an apocalyptic number.

18044846820 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 18044846820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40540953600).

18044846820 is an abundant number, since it is smaller than the sum of its proper divisors (63037060380).

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

18044846820 is a wasteful number, since it uses less digits than its factorization.

18044846820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 45.

The spelling of 18044846820 in words is "eighteen billion, forty-four million, eight hundred forty-six thousand, eight hundred twenty".