243240020 has 12 divisors (see below), whose sum is σ = 510804084. Its totient is φ = 97296000.

The previous prime is 243239989. The next prime is 243240047. The reversal of 243240020 is 20042342.

It can be written as a sum of positive squares in 2 ways, for example, as 125126596 + 118113424 = 11186^2 + 10868^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6080981 + ... + 6081020.

It is an arithmetic number, because the mean of its divisors is an integer number (42567007).

Almost surely, 2^243240020 is an apocalyptic number.

243240020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243240020 is an abundant number, since it is smaller than the sum of its proper divisors (267564064).

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

243240020 is a wasteful number, since it uses less digits than its factorization.

243240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12162010 (or 12162008 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 243240020 is about 15596.1540130893. The cubic root of 243240020 is about 624.2305368043.

Adding to 243240020 its reverse (20042342), we get a palindrome (263282362).

The spelling of 243240020 in words is "two hundred forty-three million, two hundred forty thousand, twenty".