20223161 has 4 divisors (see below), whose sum is σ = 23112192. Its totient is φ = 17334132.

The previous prime is 20223139. The next prime is 20223167. The reversal of 20223161 is 16132202.

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.

It is a cyclic number.

It is not a de Polignac number, because 20223161 - 2¹⁸ = 19961017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20223167) 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, 1444505 + ... + 1444518.

It is an arithmetic number, because the mean of its divisors is an integer number (5778048).

Almost surely, 2^20223161 is an apocalyptic number.

It is an amenable number.

20223161 is a deficient number, since it is larger than the sum of its proper divisors (2889031).

20223161 is an equidigital number, since it uses as much as digits as its factorization.

20223161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889030.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20223161 is about 4497.0169001239. The cubic root of 20223161 is about 272.4476166739.

Adding to 20223161 its reverse (16132202), we get a palindrome (36355363).

The spelling of 20223161 in words is "twenty million, two hundred twenty-three thousand, one hundred sixty-one".