231403020 has 24 divisors (see below), whose sum is σ = 647928624. Its totient is φ = 61707456.

The previous prime is 231403013. The next prime is 231403021. The reversal of 231403020 is 20304132.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (231403021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1928299 + ... + 1928418.

It is an arithmetic number, because the mean of its divisors is an integer number (26997026).

Almost surely, 2^231403020 is an apocalyptic number.

231403020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231403020 is an abundant number, since it is smaller than the sum of its proper divisors (416525604).

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

231403020 is a wasteful number, since it uses less digits than its factorization.

231403020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856729 (or 3856727 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 231403020 is about 15211.9367603208. The cubic root of 231403020 is about 613.9358688372.

Adding to 231403020 its reverse (20304132), we get a palindrome (251707152).

The spelling of 231403020 in words is "two hundred thirty-one million, four hundred three thousand, twenty".