123231202020 has 72 divisors (see below), whose sum is σ = 373849290360. Its totient is φ = 32857436160.

The previous prime is 123231202013. The next prime is 123231202021. The reversal of 123231202020 is 20202132321.

It can be written as a sum of positive squares in 4 ways, for example, as 6238472256 + 116992729764 = 78984^2 + 342042^2 .

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 = 123231201984 and 123231202002.

It is not an unprimeable number, because it can be changed into a prime (123231202021) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1515766 + ... + 1594994.

It is an arithmetic number, because the mean of its divisors is an integer number (5192351255).

Almost surely, 2^123231202020 is an apocalyptic number.

123231202020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123231202020 is an abundant number, since it is smaller than the sum of its proper divisors (250618088340).

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

123231202020 is a wasteful number, since it uses less digits than its factorization.

123231202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87885 (or 87880 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 123231202020 its reverse (20202132321), we get a palindrome (143433334341).

The spelling of 123231202020 in words is "one hundred twenty-three billion, two hundred thirty-one million, two hundred two thousand, twenty".