31230321012020 has 96 divisors (see below), whose sum is σ = 72029151210240. Its totient is φ = 11303636889600.

The previous prime is 31230321012017. The next prime is 31230321012067. The reversal of 31230321012020 is 2021012303213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31230321011983 and 31230321012001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2531345 + ... + 8298695.

It is an arithmetic number, because the mean of its divisors is an integer number (750303658440).

Almost surely, 2^{31230321012020} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31230321012020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36014575605120).

31230321012020 is an abundant number, since it is smaller than the sum of its proper divisors (40798830198220).

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

31230321012020 is a wasteful number, since it uses less digits than its factorization.

31230321012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5767785 (or 5767783 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31230321012020 its reverse (2021012303213), we get a palindrome (33251333315233).

The spelling of 31230321012020 in words is "thirty-one trillion, two hundred thirty billion, three hundred twenty-one million, twelve thousand, twenty".