220431311 has 8 divisors (see below), whose sum is σ = 229492944. Its totient is φ = 211533120.

The previous prime is 220431259. The next prime is 220431313. The reversal of 220431311 is 113134022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220431311 - 2¹⁴ = 220414927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220431311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220431313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38105 + ... + 43506.

It is an arithmetic number, because the mean of its divisors is an integer number (28686618).

Almost surely, 2^220431311 is an apocalyptic number.

220431311 is a deficient number, since it is larger than the sum of its proper divisors (9061633).

220431311 is an equidigital number, since it uses as much as digits as its factorization.

220431311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81721.

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

The square root of 220431311 is about 14846.9293458277. The cubic root of 220431311 is about 604.0753226459.

Adding to 220431311 its reverse (113134022), we get a palindrome (333565333).

The spelling of 220431311 in words is "two hundred twenty million, four hundred thirty-one thousand, three hundred eleven".