243204312020 has 24 divisors (see below), whose sum is σ = 511403762184. Its totient is φ = 97153209216.

The previous prime is 243204311899. The next prime is 243204312047. The reversal of 243204312020 is 20213402342.

It can be written as a sum of positive squares in 4 ways, for example, as 53062965316 + 190141346704 = 230354^2 + 436052^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8016707 + ... + 8046986.

It is an arithmetic number, because the mean of its divisors is an integer number (21308490091).

Almost surely, 2^243204312020 is an apocalyptic number.

243204312020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243204312020 is an abundant number, since it is smaller than the sum of its proper divisors (268199450164).

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

243204312020 is a wasteful number, since it uses less digits than its factorization.

243204312020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16064459 (or 16064457 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 243204312020 its reverse (20213402342), we get a palindrome (263417714362).

The spelling of 243204312020 in words is "two hundred forty-three billion, two hundred four million, three hundred twelve thousand, twenty".