18587512020 has 288 divisors, whose sum is σ = 69933144960. Its totient is φ = 3635036160.

The previous prime is 18587512007. The next prime is 18587512049. The reversal of 18587512020 is 2021578581.

It is a self number, because there is not a number n which added to its sum of digits gives 18587512020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 532876 + ... + 566684.

It is an arithmetic number, because the mean of its divisors is an integer number (242823420).

Almost surely, 2^18587512020 is an apocalyptic number.

18587512020 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 18587512020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34966572480).

18587512020 is an abundant number, since it is smaller than the sum of its proper divisors (51345632940).

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

18587512020 is a wasteful number, since it uses less digits than its factorization.

18587512020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33863 (or 33854 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 39.

The spelling of 18587512020 in words is "eighteen billion, five hundred eighty-seven million, five hundred twelve thousand, twenty".