243136820 has 12 divisors (see below), whose sum is σ = 510587364. Its totient is φ = 97254720.

The previous prime is 243136819. The next prime is 243136823. The reversal of 243136820 is 28631342.

It can be written as a sum of positive squares in 2 ways, for example, as 99760144 + 143376676 = 9988^2 + 11974^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243136823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6078401 + ... + 6078440.

It is an arithmetic number, because the mean of its divisors is an integer number (42548947).

Almost surely, 2^243136820 is an apocalyptic number.

243136820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243136820 is an abundant number, since it is smaller than the sum of its proper divisors (267450544).

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

243136820 is a wasteful number, since it uses less digits than its factorization.

243136820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12156850 (or 12156848 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 243136820 is about 15592.8451541083. The cubic root of 243136820 is about 624.1422430768.

The spelling of 243136820 in words is "two hundred forty-three million, one hundred thirty-six thousand, eight hundred twenty".