20641617423 has 40 divisors (see below), whose sum is σ = 37094766720. Its totient is φ = 11174403600.

The previous prime is 20641617397. The next prime is 20641617487. The reversal of 20641617423 is 32471614602.

20641617423 is a `hidden beast` number, since 2 + 0 + 641 + 6 + 1 + 7 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 20641617423 - 2¹⁴ = 20641601039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641617223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 947253 + ... + 968798.

It is an arithmetic number, because the mean of its divisors is an integer number (927369168).

Almost surely, 2^20641617423 is an apocalyptic number.

20641617423 is a deficient number, since it is larger than the sum of its proper divisors (16453149297).

20641617423 is a wasteful number, since it uses less digits than its factorization.

20641617423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916089 (or 1916080 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 20641617423 in words is "twenty billion, six hundred forty-one million, six hundred seventeen thousand, four hundred twenty-three".