31310244020 has 192 divisors, whose sum is σ = 80196480000. Its totient is φ = 10119997440.

The previous prime is 31310244019. The next prime is 31310244083. The reversal of 31310244020 is 2044201313.

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 = 31310243983 and 31310244001.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 35458499 + ... + 35459381.

It is an arithmetic number, because the mean of its divisors is an integer number (417690000).

Almost surely, 2^31310244020 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 31310244020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40098240000).

31310244020 is an abundant number, since it is smaller than the sum of its proper divisors (48886235980).

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

31310244020 is a wasteful number, since it uses less digits than its factorization.

31310244020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 1436 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31310244020 its reverse (2044201313), we get a palindrome (33354445333).

The spelling of 31310244020 in words is "thirty-one billion, three hundred ten million, two hundred forty-four thousand, twenty".