20620223161 has 4 divisors (see below), whose sum is σ = 20622542992. Its totient is φ = 20617903332.

The previous prime is 20620223149. The next prime is 20620223167. The reversal of 20620223161 is 16132202602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16132202602 = 2 ⋅8066101301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20620223161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20620223167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1146531 + ... + 1164376.

It is an arithmetic number, because the mean of its divisors is an integer number (5155635748).

Almost surely, 2^20620223161 is an apocalyptic number.

It is an amenable number.

20620223161 is a deficient number, since it is larger than the sum of its proper divisors (2319831).

20620223161 is an equidigital number, since it uses as much as digits as its factorization.

20620223161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319830.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 20620223161 its reverse (16132202602), we get a palindrome (36752425763).

The spelling of 20620223161 in words is "twenty billion, six hundred twenty million, two hundred twenty-three thousand, one hundred sixty-one".