20423645161 has 8 divisors (see below), whose sum is σ = 20576959200. Its totient is φ = 20270422560.

The previous prime is 20423645159. The next prime is 20423645191. The reversal of 20423645161 is 16154632402.

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 20423645161 - 2¹ = 20423645159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423645131) 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, 464205 + ... + 506293.

It is an arithmetic number, because the mean of its divisors is an integer number (2572119900).

Almost surely, 2^20423645161 is an apocalyptic number.

It is an amenable number.

20423645161 is a deficient number, since it is larger than the sum of its proper divisors (153314039).

20423645161 is a wasteful number, since it uses less digits than its factorization.

20423645161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45719.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 20423645161 in words is "twenty billion, four hundred twenty-three million, six hundred forty-five thousand, one hundred sixty-one".