31031213020 has 96 divisors (see below), whose sum is σ = 66569158656. Its totient is φ = 12149222400.

The previous prime is 31031212997. The next prime is 31031213023. The reversal of 31031213020 is 2031213013.

It is a super-3 number, since 3×31031213020³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31031212985 and 31031213003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031213023) 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, 99778665 + ... + 99778975.

It is an arithmetic number, because the mean of its divisors is an integer number (693428736).

Almost surely, 2^31031213020 is an apocalyptic number.

It is an amenable number.

31031213020 is an abundant number, since it is smaller than the sum of its proper divisors (35537945636).

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

31031213020 is a wasteful number, since it uses less digits than its factorization.

31031213020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31031213020 its reverse (2031213013), we get a palindrome (33062426033).

The spelling of 31031213020 in words is "thirty-one billion, thirty-one million, two hundred thirteen thousand, twenty".