243126220 has 24 divisors (see below), whose sum is σ = 511069104. Its totient is φ = 97154496.

The previous prime is 243126209. The next prime is 243126229. The reversal of 243126220 is 22621342.

It is a super-2 number, since 2×243126220² = 118220717702976800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243126191 and 243126200.

It is not an unprimeable number, because it can be changed into a prime (243126229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16899 + ... + 27781.

It is an arithmetic number, because the mean of its divisors is an integer number (21294546).

Almost surely, 2^243126220 is an apocalyptic number.

243126220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243126220 is an abundant number, since it is smaller than the sum of its proper divisors (267942884).

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

243126220 is a wasteful number, since it uses less digits than its factorization.

243126220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12009 (or 12007 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 243126220 is about 15592.5052509210. The cubic root of 243126220 is about 624.1331727326.

Adding to 243126220 its reverse (22621342), we get a palindrome (265747562).

The spelling of 243126220 in words is "two hundred forty-three million, one hundred twenty-six thousand, two hundred twenty".