220320564 has 12 divisors (see below), whose sum is σ = 514081344. Its totient is φ = 73440184.

The previous prime is 220320553. The next prime is 220320571. The reversal of 220320564 is 465023022.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9180012 + ... + 9180035.

It is an arithmetic number, because the mean of its divisors is an integer number (42840112).

Almost surely, 2^220320564 is an apocalyptic number.

It is an amenable number.

220320564 is an abundant number, since it is smaller than the sum of its proper divisors (293760780).

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

220320564 is a wasteful number, since it uses less digits than its factorization.

220320564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18360054 (or 18360052 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 220320564 is about 14843.1992508354. The cubic root of 220320564 is about 603.9741411089.

Adding to 220320564 its reverse (465023022), we get a palindrome (685343586).

The spelling of 220320564 in words is "two hundred twenty million, three hundred twenty thousand, five hundred sixty-four".