320243420 has 36 divisors (see below), whose sum is σ = 782311320. Its totient is φ = 109797408.

The previous prime is 320243411. The next prime is 320243431. The reversal of 320243420 is 24342023.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 320243392 and 320243401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162410 + ... + 164369.

It is an arithmetic number, because the mean of its divisors is an integer number (21730870).

Almost surely, 2^320243420 is an apocalyptic number.

It is an amenable number.

320243420 is an abundant number, since it is smaller than the sum of its proper divisors (462067900).

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

320243420 is a wasteful number, since it uses less digits than its factorization.

320243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326802 (or 326793 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 320243420 is about 17895.3463224381. The cubic root of 320243420 is about 684.1637690232.

Adding to 320243420 its reverse (24342023), we get a palindrome (344585443).

The spelling of 320243420 in words is "three hundred twenty million, two hundred forty-three thousand, four hundred twenty".