31122320112020 has 48 divisors (see below), whose sum is σ = 66748665005568. Its totient is φ = 12183834351360.

The previous prime is 31122320112011. The next prime is 31122320112029. The reversal of 31122320112020 is 2021102322113.

It is an interprime number because it is at equal distance from previous prime (31122320112011) and next prime (31122320112029).

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 = 31122320111983 and 31122320112001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122320112029) 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, 56842889 + ... + 57387791.

It is an arithmetic number, because the mean of its divisors is an integer number (1390597187616).

Almost surely, 2^{31122320112020} is an apocalyptic number.

It is an amenable number.

31122320112020 is an abundant number, since it is smaller than the sum of its proper divisors (35626344893548).

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

31122320112020 is a wasteful number, since it uses less digits than its factorization.

31122320112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605720 (or 605718 counting only the distinct ones).

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

Adding to 31122320112020 its reverse (2021102322113), we get a palindrome (33143422434133).

The spelling of 31122320112020 in words is "thirty-one trillion, one hundred twenty-two billion, three hundred twenty million, one hundred twelve thousand, twenty".