243144220 has 24 divisors (see below), whose sum is σ = 557021808. Its totient is φ = 88416000.

The previous prime is 243144211. The next prime is 243144233. The reversal of 243144220 is 22441342.

It is a happy number.

It is a super-2 number, since 2×243144220² = 118238223438816800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 243144191 and 243144200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552381 + ... + 552820.

It is an arithmetic number, because the mean of its divisors is an integer number (23209242).

Almost surely, 2^243144220 is an apocalyptic number.

243144220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243144220 is an abundant number, since it is smaller than the sum of its proper divisors (313877588).

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

243144220 is a wasteful number, since it uses less digits than its factorization.

243144220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105221 (or 1105219 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 243144220 is about 15593.0824406209. The cubic root of 243144220 is about 624.1485750476.

Adding to 243144220 its reverse (22441342), we get a palindrome (265585562).

The spelling of 243144220 in words is "two hundred forty-three million, one hundred forty-four thousand, two hundred twenty".