31023012020 has 192 divisors, whose sum is σ = 92618297856. Its totient is φ = 8400568320.

The previous prime is 31023012019. The next prime is 31023012029. The reversal of 31023012020 is 2021032013.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 31023011986 and 31023012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023012029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 294764 + ... + 385916.

It is an arithmetic number, because the mean of its divisors is an integer number (482386968).

Almost surely, 2^31023012020 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 31023012020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46309148928).

31023012020 is an abundant number, since it is smaller than the sum of its proper divisors (61595285836).

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

31023012020 is a wasteful number, since it uses less digits than its factorization.

31023012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91210 (or 91208 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31023012020 its reverse (2021032013), we get a palindrome (33044044033).

The spelling of 31023012020 in words is "thirty-one billion, twenty-three million, twelve thousand, twenty".