220320231 has 4 divisors (see below), whose sum is σ = 293760312. Its totient is φ = 146880152.

The previous prime is 220320223. The next prime is 220320239. The reversal of 220320231 is 132023022.

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

It is an interprime number because it is at equal distance from previous prime (220320223) and next prime (220320239).

It is a cyclic number.

It is not a de Polignac number, because 220320231 - 2³ = 220320223 is a prime.

It is a super-2 number, since 2×220320231² = 97082008375786722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220320231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220320239) 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, 36720036 + ... + 36720041.

It is an arithmetic number, because the mean of its divisors is an integer number (73440078).

Almost surely, 2^220320231 is an apocalyptic number.

220320231 is a deficient number, since it is larger than the sum of its proper divisors (73440081).

220320231 is an equidigital number, since it uses as much as digits as its factorization.

220320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73440080.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 220320231 is about 14843.1880335728. The cubic root of 220320231 is about 603.9738368197.

Adding to 220320231 its reverse (132023022), we get a palindrome (352343253).

The spelling of 220320231 in words is "two hundred twenty million, three hundred twenty thousand, two hundred thirty-one".