18766787220 has 216 divisors, whose sum is σ = 60697937664. Its totient is φ = 4692483072.

The previous prime is 18766787213. The next prime is 18766787257. The reversal of 18766787220 is 2278766781.

It is a happy number.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19090849 + ... + 19091831.

Almost surely, 2^18766787220 is an apocalyptic number.

18766787220 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 18766787220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30348968832).

18766787220 is an abundant number, since it is smaller than the sum of its proper divisors (41931150444).

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

18766787220 is a wasteful number, since it uses less digits than its factorization.

18766787220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1377 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The spelling of 18766787220 in words is "eighteen billion, seven hundred sixty-six million, seven hundred eighty-seven thousand, two hundred twenty".