220423643 has 12 divisors (see below), whose sum is σ = 243661320. Its totient is φ = 199246080.

The previous prime is 220423627. The next prime is 220423669. The reversal of 220423643 is 346324022.

It is not a de Polignac number, because 220423643 - 2⁴ = 220423627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220423603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16571 + ... + 26747.

It is an arithmetic number, because the mean of its divisors is an integer number (20305110).

Almost surely, 2^220423643 is an apocalyptic number.

220423643 is a deficient number, since it is larger than the sum of its proper divisors (23237677).

220423643 is a wasteful number, since it uses less digits than its factorization.

220423643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10378 (or 10367 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 220423643 is about 14846.6711083663. The cubic root of 220423643 is about 604.0683180402.

Adding to 220423643 its reverse (346324022), we get a palindrome (566747665).

The spelling of 220423643 in words is "two hundred twenty million, four hundred twenty-three thousand, six hundred forty-three".