188400382020 has 72 divisors (see below), whose sum is σ = 601559125440. Its totient is φ = 47595885120.

The previous prime is 188400382007. The next prime is 188400382031. The reversal of 188400382020 is 20283004881.

It is a happy number.

188400382020 is a `hidden beast` number, since 18 + 8 + 400 + 38 + 202 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27540496 + ... + 27547335.

Almost surely, 2^188400382020 is an apocalyptic number.

188400382020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188400382020 is an abundant number, since it is smaller than the sum of its proper divisors (413158743420).

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

188400382020 is a wasteful number, since it uses less digits than its factorization.

188400382020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55087865 (or 55087860 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 188400382020 in words is "one hundred eighty-eight billion, four hundred million, three hundred eighty-two thousand, twenty".