18020149056 has 1008 divisors, whose sum is σ = 71714051136. Its totient is φ = 4431200256.

The previous prime is 18020149031. The next prime is 18020149099. The reversal of 18020149056 is 65094102081.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a super-2 number, since 2×18020149056² (a number of 21 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18020149056.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 168412555 + ... + 168412661.

It is an arithmetic number, because the mean of its divisors is an integer number (71144892).

Almost surely, 2^18020149056 is an apocalyptic number.

18020149056 is a gapful number since it is divisible by the number (16) 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 18020149056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35857025568).

18020149056 is an abundant number, since it is smaller than the sum of its proper divisors (53693902080).

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

18020149056 is a wasteful number, since it uses less digits than its factorization.

18020149056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 18020149056 in words is "eighteen billion, twenty million, one hundred forty-nine thousand, fifty-six".