320553443 has 12 divisors (see below), whose sum is σ = 385748640. Its totient is φ = 265284432.

The previous prime is 320553437. The next prime is 320553473. The reversal of 320553443 is 344355023.

It is not a de Polignac number, because 320553443 - 2¹⁸ = 320291299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320553473) 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, 111371 + ... + 114212.

It is an arithmetic number, because the mean of its divisors is an integer number (32145720).

Almost surely, 2^320553443 is an apocalyptic number.

320553443 is a deficient number, since it is larger than the sum of its proper divisors (65195197).

320553443 is a wasteful number, since it uses less digits than its factorization.

320553443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225626 (or 225619 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 29.

The square root of 320553443 is about 17904.0063393644. The cubic root of 320553443 is about 684.3844741514.

The spelling of 320553443 in words is "three hundred twenty million, five hundred fifty-three thousand, four hundred forty-three".