243322020 has 144 divisors (see below), whose sum is σ = 788755968. Its totient is φ = 60503040.

The previous prime is 243322019. The next prime is 243322021. The reversal of 243322020 is 20223342.

243322020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (243322019) and next prime (243322021).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 243321984 and 243322002.

It is not an unprimeable number, because it can be changed into a prime (243322021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 400557 + ... + 401163.

It is an arithmetic number, because the mean of its divisors is an integer number (5477472).

Almost surely, 2^243322020 is an apocalyptic number.

243322020 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 243322020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394377984).

243322020 is an abundant number, since it is smaller than the sum of its proper divisors (545433948).

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

243322020 is a wasteful number, since it uses less digits than its factorization.

243322020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770 (or 765 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 243322020 is about 15598.7826448092. The cubic root of 243322020 is about 624.3006748695.

Adding to 243322020 its reverse (20223342), we get a palindrome (263545362).

The spelling of 243322020 in words is "two hundred forty-three million, three hundred twenty-two thousand, twenty".