18666786020 has 48 divisors (see below), whose sum is σ = 40163655168. Its totient is φ = 7284236160.

The previous prime is 18666786013. The next prime is 18666786053. The reversal of 18666786020 is 2068766681.

It is a happy number.

It is a super-3 number, since 3×18666786020³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18666786020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260414 + ... + 324266.

It is an arithmetic number, because the mean of its divisors is an integer number (836742816).

Almost surely, 2^18666786020 is an apocalyptic number.

18666786020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18666786020 is an abundant number, since it is smaller than the sum of its proper divisors (21496869148).

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

18666786020 is a wasteful number, since it uses less digits than its factorization.

18666786020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64220 (or 64218 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 18666786020 in words is "eighteen billion, six hundred sixty-six million, seven hundred eighty-six thousand, twenty".