243040020 has 48 divisors (see below), whose sum is σ = 716331840. Its totient is φ = 61399296.

The previous prime is 243040003. The next prime is 243040067. The reversal of 243040020 is 20040342.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 15 ways as a sum of consecutive naturals, for example, 105457 + ... + 107736.

It is an arithmetic number, because the mean of its divisors is an integer number (14923580).

Almost surely, 2^243040020 is an apocalyptic number.

243040020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243040020 is an abundant number, since it is smaller than the sum of its proper divisors (473291820).

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

243040020 is a wasteful number, since it uses less digits than its factorization.

243040020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213224 (or 213222 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 243040020 is about 15589.7408573716. The cubic root of 243040020 is about 624.0594022181.

Adding to 243040020 its reverse (20040342), we get a palindrome (263080362).

The spelling of 243040020 in words is "two hundred forty-three million, forty thousand, twenty".