18263371720 has 128 divisors (see below), whose sum is σ = 46933136640. Its totient is φ = 6331325440.

The previous prime is 18263371703. The next prime is 18263371727. The reversal of 18263371720 is 2717336281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (18263371727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3205194 + ... + 3210886.

It is an arithmetic number, because the mean of its divisors is an integer number (366665130).

Almost surely, 2^18263371720 is an apocalyptic number.

18263371720 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 18263371720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23466568320).

18263371720 is an abundant number, since it is smaller than the sum of its proper divisors (28669764920).

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

18263371720 is a wasteful number, since it uses less digits than its factorization.

18263371720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6055 (or 6051 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

It can be divided in two parts, 18263 and 371720, that added together give a palindrome (389983).

The spelling of 18263371720 in words is "eighteen billion, two hundred sixty-three million, three hundred seventy-one thousand, seven hundred twenty".