231404020 has 24 divisors (see below), whose sum is σ = 487153800. Its totient is φ = 92332032.

The previous prime is 231404011. The next prime is 231404039. The reversal of 231404020 is 20404132.

It can be written as a sum of positive squares in 4 ways, for example, as 128097124 + 103306896 = 11318^2 + 10164^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231403985 and 231404003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5965 + ... + 22324.

It is an arithmetic number, because the mean of its divisors is an integer number (20298075).

Almost surely, 2^231404020 is an apocalyptic number.

231404020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231404020 is an abundant number, since it is smaller than the sum of its proper divisors (255749780).

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

231404020 is a wasteful number, since it uses less digits than its factorization.

231404020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28707 (or 28705 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 231404020 is about 15211.9696292098. The cubic root of 231404020 is about 613.9367532034.

Adding to 231404020 its reverse (20404132), we get a palindrome (251808152).

The spelling of 231404020 in words is "two hundred thirty-one million, four hundred four thousand, twenty".