31223020340020 has 24 divisors (see below), whose sum is σ = 65663231806368. Its totient is φ = 12471134023200.

The previous prime is 31223020340009. The next prime is 31223020340033. The reversal of 31223020340020 is 2004302032213.

It is a junction number, because it is equal to n+sod(n) for n = 31223020339973 and 31223020340000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1129617886 + ... + 1129645525.

It is an arithmetic number, because the mean of its divisors is an integer number (2735967991932).

Almost surely, 2^{31223020340020} is an apocalyptic number.

It is an amenable number.

31223020340020 is an abundant number, since it is smaller than the sum of its proper divisors (34440211466348).

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

31223020340020 is a wasteful number, since it uses less digits than its factorization.

31223020340020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259264111 (or 2259264109 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 31223020340020 its reverse (2004302032213), we get a palindrome (33227322372233).

The spelling of 31223020340020 in words is "thirty-one trillion, two hundred twenty-three billion, twenty million, three hundred forty thousand, twenty".