220431 has 4 divisors (see below), whose sum is σ = 293912. Its totient is φ = 146952.

The previous prime is 220421. The next prime is 220447. The reversal of 220431 is 134022.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 220431 - 2⁵ = 220399 is a prime.

It is a super-2 number, since 2×220431² = 97179651522, which contains 22 as substring.

It is a D-number.

It is the 470-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220411) by changing a digit.

It is a nontrivial repunit in base 469.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36736 + ... + 36741.

It is an arithmetic number, because the mean of its divisors is an integer number (73478).

2²²⁰⁴³¹ is an apocalyptic number.

220431 is a deficient number, since it is larger than the sum of its proper divisors (73481).

220431 is an equidigital number, since it uses as much as digits as its factorization.

220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73480.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 220431 is about 469.5007987214. The cubic root of 220431 is about 60.4075038555.

Adding to 220431 its reverse (134022), we get a palindrome (354453).

The spelling of 220431 in words is "two hundred twenty thousand, four hundred thirty-one".