18903022236 has 288 divisors, whose sum is σ = 58810752000. Its totient is φ = 5107132800.

The previous prime is 18903022223. The next prime is 18903022291. The reversal of 18903022236 is 63222030981.

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 18903022236.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28684075 + ... + 28684733.

It is an arithmetic number, because the mean of its divisors is an integer number (204204000).

Almost surely, 2^18903022236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18903022236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29405376000).

18903022236 is an abundant number, since it is smaller than the sum of its proper divisors (39907729764).

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

18903022236 is a wasteful number, since it uses less digits than its factorization.

18903022236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 18903022236 in words is "eighteen billion, nine hundred three million, twenty-two thousand, two hundred thirty-six".