243051820 has 24 divisors (see below), whose sum is σ = 556810128. Its totient is φ = 88382400.

The previous prime is 243051763. The next prime is 243051829. The reversal of 243051820 is 28150342.

It is not an unprimeable number, because it can be changed into a prime (243051829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552171 + ... + 552610.

It is an arithmetic number, because the mean of its divisors is an integer number (23200422).

Almost surely, 2^243051820 is an apocalyptic number.

243051820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243051820 is an abundant number, since it is smaller than the sum of its proper divisors (313758308).

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

243051820 is a wasteful number, since it uses less digits than its factorization.

243051820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104801 (or 1104799 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 243051820 is about 15590.1193067917. The cubic root of 243051820 is about 624.0695017643.

The spelling of 243051820 in words is "two hundred forty-three million, fifty-one thousand, eight hundred twenty".