243420320 has 96 divisors (see below), whose sum is σ = 675682560. Its totient is φ = 81699840.

The previous prime is 243420319. The next prime is 243420329. The reversal of 243420320 is 23024342.

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 = 243420292 and 243420301.

It is not an unprimeable number, because it can be changed into a prime (243420329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17561 + ... + 28199.

It is an arithmetic number, because the mean of its divisors is an integer number (7038360).

Almost surely, 2^243420320 is an apocalyptic number.

243420320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243420320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337841280).

243420320 is an abundant number, since it is smaller than the sum of its proper divisors (432262240).

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

243420320 is a wasteful number, since it uses less digits than its factorization.

243420320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10678 (or 10670 counting only the distinct ones).

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

The square root of 243420320 is about 15601.9332135476. The cubic root of 243420320 is about 624.3847342490.

Adding to 243420320 its reverse (23024342), we get a palindrome (266444662).

The spelling of 243420320 in words is "two hundred forty-three million, four hundred twenty thousand, three hundred twenty".