243232440220 has 192 divisors, whose sum is σ = 672271488000. Its totient is φ = 71616061440.

The previous prime is 243232440137. The next prime is 243232440229. The reversal of 243232440220 is 22044232342.

It is a happy number.

243232440220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243232440229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10317006 + ... + 10340554.

It is an arithmetic number, because the mean of its divisors is an integer number (3501414000).

Almost surely, 2^243232440220 is an apocalyptic number.

243232440220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243232440220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336135744000).

243232440220 is an abundant number, since it is smaller than the sum of its proper divisors (429039047780).

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

243232440220 is a wasteful number, since it uses less digits than its factorization.

243232440220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23948 (or 23946 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 243232440220 its reverse (22044232342), we get a palindrome (265276672562).

The spelling of 243232440220 in words is "two hundred forty-three billion, two hundred thirty-two million, four hundred forty thousand, two hundred twenty".