20635645523 has 8 divisors (see below), whose sum is σ = 20673438720. Its totient is φ = 20597888520.

The previous prime is 20635645469. The next prime is 20635645529. The reversal of 20635645523 is 32554653602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20635645523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20635645529) 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, 1299236 + ... + 1315022.

It is an arithmetic number, because the mean of its divisors is an integer number (2584179840).

Almost surely, 2^20635645523 is an apocalyptic number.

20635645523 is a deficient number, since it is larger than the sum of its proper divisors (37793197).

20635645523 is a wasteful number, since it uses less digits than its factorization.

20635645523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18097.

The product of its (nonzero) digits is 648000, while the sum is 41.

The spelling of 20635645523 in words is "twenty billion, six hundred thirty-five million, six hundred forty-five thousand, five hundred twenty-three".