31023000020 has 48 divisors (see below), whose sum is σ = 66973362960. Its totient is φ = 12062214144.

The previous prime is 31022999993. The next prime is 31023000023. The reversal of 31023000020 is 2000032013.

It can be written as a sum of positive squares in 8 ways, for example, as 118766404 + 30904233616 = 10898^2 + 175796^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31022999965 and 31023000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023000023) 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 15 ways as a sum of consecutive naturals, for example, 771452 + ... + 810668.

It is an arithmetic number, because the mean of its divisors is an integer number (1395278395).

Almost surely, 2^31023000020 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 31023000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33486681480).

31023000020 is an abundant number, since it is smaller than the sum of its proper divisors (35950362940).

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

31023000020 is a wasteful number, since it uses less digits than its factorization.

31023000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40332 (or 40330 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

Adding to 31023000020 its reverse (2000032013), we get a palindrome (33023032033).

The spelling of 31023000020 in words is "thirty-one billion, twenty-three million, twenty", and thus it is an aban number and an uban number.