220400646 has 16 divisors (see below), whose sum is σ = 464001600. Its totient is φ = 69600168.

The previous prime is 220400629. The next prime is 220400701. The reversal of 220400646 is 646004022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 966556 + ... + 966783.

It is an arithmetic number, because the mean of its divisors is an integer number (29000100).

Almost surely, 2^220400646 is an apocalyptic number.

220400646 is an abundant number, since it is smaller than the sum of its proper divisors (243600954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220400646 is a wasteful number, since it uses less digits than its factorization.

220400646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933363.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 220400646 is about 14845.8966047861. The cubic root of 220400646 is about 604.0473096431.

Adding to 220400646 its reverse (646004022), we get a palindrome (866404668).

The spelling of 220400646 in words is "two hundred twenty million, four hundred thousand, six hundred forty-six".