31122031122020 has 24 divisors (see below), whose sum is σ = 69200751554424. Its totient is φ = 11716529363456.

The previous prime is 31122031122001. The next prime is 31122031122023. The reversal of 31122031122020 is 2022113022113.

It can be written as a sum of positive squares in 4 ways, for example, as 3379920463936 + 27742110658084 = 1838456^2 + 5267078^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31122031121983 and 31122031122001.

It is not an unprimeable number, because it can be changed into a prime (31122031122023) 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, 45767692487 + ... + 45767693166.

It is an arithmetic number, because the mean of its divisors is an integer number (2883364648101).

Almost surely, 2^{31122031122020} is an apocalyptic number.

It is an amenable number.

31122031122020 is an abundant number, since it is smaller than the sum of its proper divisors (38078720432404).

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

31122031122020 is a wasteful number, since it uses less digits than its factorization.

31122031122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91535385679 (or 91535385677 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31122031122020 its reverse (2022113022113), we get a palindrome (33144144144133).

The spelling of 31122031122020 in words is "thirty-one trillion, one hundred twenty-two billion, thirty-one million, one hundred twenty-two thousand, twenty".