231113212020 has 36 divisors (see below), whose sum is σ = 701043410340. Its totient is φ = 61630189824.

The previous prime is 231113211977. The next prime is 231113212069. The reversal of 231113212020 is 20212311132.

It can be written as a sum of positive squares in 2 ways, for example, as 25583362704 + 205529849316 = 159948^2 + 453354^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231113211984 and 231113212002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 641980965 + ... + 641981324.

It is an arithmetic number, because the mean of its divisors is an integer number (19473428065).

Almost surely, 2^231113212020 is an apocalyptic number.

231113212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231113212020 is an abundant number, since it is smaller than the sum of its proper divisors (469930198320).

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

231113212020 is a wasteful number, since it uses less digits than its factorization.

231113212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283962304 (or 1283962299 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 231113212020 its reverse (20212311132), we get a palindrome (251325523152).

The spelling of 231113212020 in words is "two hundred thirty-one billion, one hundred thirteen million, two hundred twelve thousand, twenty".