18863508720 has 320 divisors, whose sum is σ = 72678491136. Its totient is φ = 3948134400.

The previous prime is 18863508679. The next prime is 18863508721. The reversal of 18863508720 is 2780536881.

It is a super-2 number, since 2×18863508720² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18863508720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18863508721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1047795 + ... + 1065645.

Almost surely, 2^18863508720 is an apocalyptic number.

18863508720 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 18863508720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36339245568).

18863508720 is an abundant number, since it is smaller than the sum of its proper divisors (53814982416).

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

18863508720 is a wasteful number, since it uses less digits than its factorization.

18863508720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17928 (or 17922 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 18863508720 in words is "eighteen billion, eight hundred sixty-three million, five hundred eight thousand, seven hundred twenty".