243320420 has 24 divisors (see below), whose sum is σ = 583969344. Its totient is φ = 83424096.

The previous prime is 243320387. The next prime is 243320431. The reversal of 243320420 is 24023342.

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 = 243320392 and 243320401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868862 + ... + 869141.

It is an arithmetic number, because the mean of its divisors is an integer number (24332056).

Almost surely, 2^243320420 is an apocalyptic number.

243320420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243320420 is an abundant number, since it is smaller than the sum of its proper divisors (340648924).

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

243320420 is a wasteful number, since it uses less digits than its factorization.

243320420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738019 (or 1738017 counting only the distinct ones).

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

The square root of 243320420 is about 15598.7313586714. The cubic root of 243320420 is about 624.2993064726.

Adding to 243320420 its reverse (24023342), we get a palindrome (267343762).

The spelling of 243320420 in words is "two hundred forty-three million, three hundred twenty thousand, four hundred twenty".