220331864 has 16 divisors (see below), whose sum is σ = 421912800. Its totient is φ = 107821792.

The previous prime is 220331863. The next prime is 220331893. The reversal of 220331864 is 468133022.

It is a super-2 number, since 2×220331864² = 97092260587428992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220331863) 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, 292619 + ... + 293370.

It is an arithmetic number, because the mean of its divisors is an integer number (26369550).

Almost surely, 2^220331864 is an apocalyptic number.

It is an amenable number.

220331864 is a deficient number, since it is larger than the sum of its proper divisors (201580936).

220331864 is a wasteful number, since it uses less digits than its factorization.

220331864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586042 (or 586038 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 220331864 is about 14843.5798916569. The cubic root of 220331864 is about 603.9844666561.

Adding to 220331864 its reverse (468133022), we get a palindrome (688464886).

The spelling of 220331864 in words is "two hundred twenty million, three hundred thirty-one thousand, eight hundred sixty-four".