243320020 has 24 divisors (see below), whose sum is σ = 512170344. Its totient is φ = 97099776.

The previous prime is 243320017. The next prime is 243320027. The reversal of 243320020 is 20023342.

It can be written as a sum of positive squares in 4 ways, for example, as 17539344 + 225780676 = 4188^2 + 15026^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243319976 and 243320003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243320027) by changing a digit.

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, 5389 + ... + 22708.

It is an arithmetic number, because the mean of its divisors is an integer number (21340431).

Almost surely, 2^243320020 is an apocalyptic number.

243320020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243320020 is an abundant number, since it is smaller than the sum of its proper divisors (268850324).

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

243320020 is a wasteful number, since it uses less digits than its factorization.

243320020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28539 (or 28537 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 243320020 is about 15598.7185371107. The cubic root of 243320020 is about 624.2989643725.

Adding to 243320020 its reverse (20023342), we get a palindrome (263343362).

The spelling of 243320020 in words is "two hundred forty-three million, three hundred twenty thousand, twenty".