243242220 has 96 divisors (see below), whose sum is σ = 740456640. Its totient is φ = 59304960.

The previous prime is 243242203. The next prime is 243242231. The reversal of 243242220 is 22242342.

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, 83590 + ... + 86450.

It is an arithmetic number, because the mean of its divisors is an integer number (7713090).

Almost surely, 2^243242220 is an apocalyptic number.

243242220 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 243242220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370228320).

243242220 is an abundant number, since it is smaller than the sum of its proper divisors (497214420).

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

243242220 is a wasteful number, since it uses less digits than its factorization.

243242220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995 (or 2993 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 243242220 is about 15596.2245431386. The cubic root of 243242220 is about 624.2324187631.

Adding to 243242220 its reverse (22242342), we get a palindrome (265484562).

The spelling of 243242220 in words is "two hundred forty-three million, two hundred forty-two thousand, two hundred twenty".