31112442020 has 72 divisors (see below), whose sum is σ = 72725251200. Its totient is φ = 11170336320.

The previous prime is 31112441981. The next prime is 31112442103. The reversal of 31112442020 is 2024421113.

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 = 31112441983 and 31112442001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109811 + ... + 272549.

Almost surely, 2^31112442020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31112442020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36362625600).

31112442020 is an abundant number, since it is smaller than the sum of its proper divisors (41612809180).

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

31112442020 is a wasteful number, since it uses less digits than its factorization.

31112442020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162849 (or 162836 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31112442020 its reverse (2024421113), we get a palindrome (33136863133).

The spelling of 31112442020 in words is "thirty-one billion, one hundred twelve million, four hundred forty-two thousand, twenty".