31222020440 has 64 divisors (see below), whose sum is σ = 75728036160. Its totient is φ = 11516751360.

The previous prime is 31222020437. The next prime is 31222020469. The reversal of 31222020440 is 4402022213.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507002 + ... + 565238.

It is an arithmetic number, because the mean of its divisors is an integer number (1183250565).

Almost surely, 2^31222020440 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 31222020440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37864018080).

31222020440 is an abundant number, since it is smaller than the sum of its proper divisors (44506015720).

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

31222020440 is a wasteful number, since it uses less digits than its factorization.

31222020440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59292 (or 59288 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 31222020440 its reverse (4402022213), we get a palindrome (35624042653).

The spelling of 31222020440 in words is "thirty-one billion, two hundred twenty-two million, twenty thousand, four hundred forty".