31021023020 has 144 divisors (see below), whose sum is σ = 76265843808. Its totient is φ = 10528358400.

The previous prime is 31021022959. The next prime is 31021023029. The reversal of 31021023020 is 2032012013.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31021022986 and 31021023004.

It is not an unprimeable number, because it can be changed into a prime (31021023029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3226220 + ... + 3235820.

Almost surely, 2^31021023020 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 31021023020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38132921904).

31021023020 is an abundant number, since it is smaller than the sum of its proper divisors (45244820788).

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

31021023020 is a wasteful number, since it uses less digits than its factorization.

31021023020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9700 (or 9681 counting only the distinct ones).

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

Adding to 31021023020 its reverse (2032012013), we get a palindrome (33053035033).

The spelling of 31021023020 in words is "thirty-one billion, twenty-one million, twenty-three thousand, twenty".