20535040188 has 96 divisors (see below), whose sum is σ = 57377510400. Its totient is φ = 6313712832.

The previous prime is 20535040133. The next prime is 20535040213. The reversal of 20535040188 is 88104053502.

It is a happy number.

20535040188 is a `hidden beast` number, since 2 + 0 + 535 + 0 + 40 + 1 + 88 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2161633 + ... + 2171111.

It is an arithmetic number, because the mean of its divisors is an integer number (597682400).

Almost surely, 2^20535040188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20535040188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28688755200).

20535040188 is an abundant number, since it is smaller than the sum of its proper divisors (36842470212).

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

20535040188 is a wasteful number, since it uses less digits than its factorization.

20535040188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11048 (or 11040 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 20535040188 in words is "twenty billion, five hundred thirty-five million, forty thousand, one hundred eighty-eight".