188780020020 has 72 divisors (see below), whose sum is σ = 606317015304. Its totient is φ = 47380082688.

The previous prime is 188780019947. The next prime is 188780020021. The reversal of 188780020020 is 20020087881.

It can be written as a sum of positive squares in 4 ways, for example, as 88562188836 + 100217831184 = 297594^2 + 316572^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188780020021) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 30843349 + ... + 30849468.

It is an arithmetic number, because the mean of its divisors is an integer number (8421069657).

Almost surely, 2^188780020020 is an apocalyptic number.

188780020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188780020020 is an abundant number, since it is smaller than the sum of its proper divisors (417536995284).

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

188780020020 is a wasteful number, since it uses less digits than its factorization.

188780020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61692849 (or 61692844 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The spelling of 188780020020 in words is "one hundred eighty-eight billion, seven hundred eighty million, twenty thousand, twenty".