20711529636 has 96 divisors (see below), whose sum is σ = 56600893440. Its totient is φ = 5772501504.

The previous prime is 20711529623. The next prime is 20711529659. The reversal of 20711529636 is 63692511702.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 561820 + ... + 597548.

It is an arithmetic number, because the mean of its divisors is an integer number (589592640).

Almost surely, 2^20711529636 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 20711529636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28300446720).

20711529636 is an abundant number, since it is smaller than the sum of its proper divisors (35889363804).

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

20711529636 is a wasteful number, since it uses less digits than its factorization.

20711529636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35913 (or 35911 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 20711529636 in words is "twenty billion, seven hundred eleven million, five hundred twenty-nine thousand, six hundred thirty-six".