220404161 has 4 divisors (see below), whose sum is σ = 232004400. Its totient is φ = 208803924.

The previous prime is 220404143. The next prime is 220404169. The reversal of 220404161 is 161404022.

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 220404161 - 2⁶ = 220404097 is a prime.

It is a super-2 number, since 2×220404161² = 97155988372227842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220404169) 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, 5800091 + ... + 5800128.

It is an arithmetic number, because the mean of its divisors is an integer number (58001100).

Almost surely, 2^220404161 is an apocalyptic number.

It is an amenable number.

220404161 is a deficient number, since it is larger than the sum of its proper divisors (11600239).

220404161 is a wasteful number, since it uses less digits than its factorization.

220404161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11600238.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 220404161 is about 14846.0149871944. The cubic root of 220404161 is about 604.0505207877.

Adding to 220404161 its reverse (161404022), we get a palindrome (381808183).

The spelling of 220404161 in words is "two hundred twenty million, four hundred four thousand, one hundred sixty-one".