20711535678 has 64 divisors (see below), whose sum is σ = 46506597120. Its totient is φ = 6831845856.

The previous prime is 20711535661. The next prime is 20711535683. The reversal of 20711535678 is 87653511702.

It is a happy number.

20711535678 is a `hidden beast` number, since 2 + 0 + 71 + 15 + 3 + 567 + 8 = 666.

20711535678 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (45) 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 polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8394201 + ... + 8396667.

It is an arithmetic number, because the mean of its divisors is an integer number (726665580).

Almost surely, 2^20711535678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20711535678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23253298560).

20711535678 is an abundant number, since it is smaller than the sum of its proper divisors (25795061442).

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

20711535678 is a wasteful number, since it uses less digits than its factorization.

20711535678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4038 (or 4032 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 20711535678 in words is "twenty billion, seven hundred eleven million, five hundred thirty-five thousand, six hundred seventy-eight".