231405403220 has 24 divisors (see below), whose sum is σ = 486849616008. Its totient is φ = 92391062400.

The previous prime is 231405403189. The next prime is 231405403277. The reversal of 231405403220 is 22304504132.

231405403220 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12879072196 + 218526331024 = 113486^2 + 467468^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 231405403220.

It is a congruent number.

It is an unprimeable number.

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, 10682591 + ... + 10704230.

It is an arithmetic number, because the mean of its divisors is an integer number (20285400667).

Almost surely, 2^231405403220 is an apocalyptic number.

231405403220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231405403220 is an abundant number, since it is smaller than the sum of its proper divisors (255444212788).

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

231405403220 is a wasteful number, since it uses less digits than its factorization.

231405403220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21387371 (or 21387369 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 231405403220 its reverse (22304504132), we get a palindrome (253709907352).

The spelling of 231405403220 in words is "two hundred thirty-one billion, four hundred five million, four hundred three thousand, two hundred twenty".