31322120020 has 48 divisors (see below), whose sum is σ = 67506784128. Its totient is φ = 12203515520.

The previous prime is 31322120017. The next prime is 31322120021. The reversal of 31322120020 is 2002122313.

It is a junction number, because it is equal to n+sod(n) for n = 31322119976 and 31322120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31322120021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15019 + ... + 250738.

It is an arithmetic number, because the mean of its divisors is an integer number (1406391336).

Almost surely, 2^31322120020 is an apocalyptic number.

It is an amenable number.

31322120020 is an abundant number, since it is smaller than the sum of its proper divisors (36184664108).

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

31322120020 is a wasteful number, since it uses less digits than its factorization.

31322120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265920 (or 265918 counting only the distinct ones).

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

Adding to 31322120020 its reverse (2002122313), we get a palindrome (33324242333).

The spelling of 31322120020 in words is "thirty-one billion, three hundred twenty-two million, one hundred twenty thousand, twenty".