203143220 has 72 divisors (see below), whose sum is σ = 501600456. Its totient is φ = 68898816.

The previous prime is 203143201. The next prime is 203143243. The reversal of 203143220 is 22341302.

It can be written as a sum of positive squares in 4 ways, for example, as 23716 + 203119504 = 154^2 + 14252^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93992 + ... + 96128.

It is an arithmetic number, because the mean of its divisors is an integer number (6966673).

Almost surely, 2^203143220 is an apocalyptic number.

203143220 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 203143220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250800228).

203143220 is an abundant number, since it is smaller than the sum of its proper divisors (298457236).

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

203143220 is a wasteful number, since it uses less digits than its factorization.

203143220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257 (or 2248 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 203143220 is about 14252.8319992905. The cubic root of 203143220 is about 587.8512473300.

Adding to 203143220 its reverse (22341302), we get a palindrome (225484522).

The spelling of 203143220 in words is "two hundred three million, one hundred forty-three thousand, two hundred twenty".