31232122020 has 96 divisors (see below), whose sum is σ = 105999949440. Its totient is φ = 7571422080.

The previous prime is 31232122007. The next prime is 31232122099. The reversal of 31232122020 is 2022123213.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31232121984 and 31232122002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2623027 + ... + 2634906.

It is an arithmetic number, because the mean of its divisors is an integer number (1104166140).

Almost surely, 2^31232122020 is an apocalyptic number.

31232122020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31232122020 is an abundant number, since it is smaller than the sum of its proper divisors (74767827420).

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

31232122020 is a wasteful number, since it uses less digits than its factorization.

31232122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257962 (or 5257954 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31232122020 its reverse (2022123213), we get a palindrome (33254245233).

The spelling of 31232122020 in words is "thirty-one billion, two hundred thirty-two million, one hundred twenty-two thousand, twenty".