243431220 has 96 divisors (see below), whose sum is σ = 728017920. Its totient is φ = 60641280.

The previous prime is 243431183. The next prime is 243431231. The reversal of 243431220 is 22134342.

243431220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51684 + ... + 56196.

It is an arithmetic number, because the mean of its divisors is an integer number (7583520).

Almost surely, 2^243431220 is an apocalyptic number.

243431220 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 243431220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364008960).

243431220 is an abundant number, since it is smaller than the sum of its proper divisors (484586700).

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

243431220 is a wasteful number, since it uses less digits than its factorization.

243431220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585 (or 4583 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 243431220 is about 15602.2825253230. The cubic root of 243431220 is about 624.3940537832.

Adding to 243431220 its reverse (22134342), we get a palindrome (265565562).

The spelling of 243431220 in words is "two hundred forty-three million, four hundred thirty-one thousand, two hundred twenty".