31223210020 has 24 divisors (see below), whose sum is σ = 66547381824. Its totient is φ = 12302876256.

The previous prime is 31223210003. The next prime is 31223210027. The reversal of 31223210020 is 2001232213.

It is a junction number, because it is equal to n+sod(n) for n = 31223209976 and 31223210003.

It is not an unprimeable number, because it can be changed into a prime (31223210027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11649112 + ... + 11651791.

It is an arithmetic number, because the mean of its divisors is an integer number (2772807576).

Almost surely, 2^31223210020 is an apocalyptic number.

It is an amenable number.

31223210020 is an abundant number, since it is smaller than the sum of its proper divisors (35324171804).

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

31223210020 is a wasteful number, since it uses less digits than its factorization.

31223210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23300979 (or 23300977 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31223210020 its reverse (2001232213), we get a palindrome (33224442233).

The spelling of 31223210020 in words is "thirty-one billion, two hundred twenty-three million, two hundred ten thousand, twenty".