31023020 has 96 divisors (see below), whose sum is σ = 78599808. Its totient is φ = 10063872.

The previous prime is 31023007. The next prime is 31023023. The reversal of 31023020 is 2032013.

It is a junction number, because it is equal to n+sod(n) for n = 31022992 and 31023010.

It is not an unprimeable number, because it can be changed into a prime (31023023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274484 + ... + 274596.

It is an arithmetic number, because the mean of its divisors is an integer number (818748).

Almost surely, 2^31023020 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 31023020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39299904).

31023020 is an abundant number, since it is smaller than the sum of its proper divisors (47576788).

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

31023020 is a wasteful number, since it uses less digits than its factorization.

31023020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 217 counting only the distinct ones).

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

The square root of 31023020 is about 5569.8312362225. The cubic root of 31023020 is about 314.2158036157.

Adding to 31023020 its reverse (2032013), we get a palindrome (33055033).

The spelling of 31023020 in words is "thirty-one million, twenty-three thousand, twenty".