20528605823 has 32 divisors (see below), whose sum is σ = 23267672064. Its totient is φ = 17949600000.

The previous prime is 20528605763. The next prime is 20528605831. The reversal of 20528605823 is 32850682502.

It is a cyclic number.

It is not a de Polignac number, because 20528605823 - 2¹⁰ = 20528604799 is a prime.

It is a super-2 number, since 2×20528605823² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528602823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12343490 + ... + 12345152.

It is an arithmetic number, because the mean of its divisors is an integer number (727114752).

Almost surely, 2^20528605823 is an apocalyptic number.

20528605823 is a deficient number, since it is larger than the sum of its proper divisors (2739066241).

20528605823 is a wasteful number, since it uses less digits than its factorization.

20528605823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 20528605823 in words is "twenty billion, five hundred twenty-eight million, six hundred five thousand, eight hundred twenty-three".