231620020 has 24 divisors (see below), whose sum is σ = 486741024. Its totient is φ = 92583456.

The previous prime is 231619987. The next prime is 231620027. The reversal of 231620020 is 20026132.

It is a junction number, because it is equal to n+sod(n) for n = 231619976 and 231620003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231620027) by changing a digit.

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, 34239 + ... + 40441.

It is an arithmetic number, because the mean of its divisors is an integer number (20280876).

Almost surely, 2^231620020 is an apocalyptic number.

231620020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231620020 is an abundant number, since it is smaller than the sum of its proper divisors (255121004).

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

231620020 is a wasteful number, since it uses less digits than its factorization.

231620020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8079 (or 8077 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231620020 is about 15219.0676455557. The cubic root of 231620020 is about 614.1277166089.

Adding to 231620020 its reverse (20026132), we get a palindrome (251646152).

The spelling of 231620020 in words is "two hundred thirty-one million, six hundred twenty thousand, twenty".