20528638771 has 8 divisors (see below), whose sum is σ = 20934657360. Its totient is φ = 20123312352.

The previous prime is 20528638769. The next prime is 20528638817. The reversal of 20528638771 is 17783682502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20528638771 - 2¹ = 20528638769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20528632771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112936 + ... + 231973.

It is an arithmetic number, because the mean of its divisors is an integer number (2616832170).

Almost surely, 2^20528638771 is an apocalyptic number.

20528638771 is a deficient number, since it is larger than the sum of its proper divisors (406018589).

20528638771 is a wasteful number, since it uses less digits than its factorization.

20528638771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346085.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 20528638771 in words is "twenty billion, five hundred twenty-eight million, six hundred thirty-eight thousand, seven hundred seventy-one".