31332120320 has 72 divisors (see below), whose sum is σ = 75159433440. Its totient is φ = 12514611200.

The previous prime is 31332120307. The next prime is 31332120353. The reversal of 31332120320 is 2302123313.

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 = 31332120292 and 31332120301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879821 + ... + 914739.

It is an arithmetic number, because the mean of its divisors is an integer number (1043881020).

Almost surely, 2^31332120320 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 31332120320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37579716720).

31332120320 is an abundant number, since it is smaller than the sum of its proper divisors (43827313120).

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

31332120320 is an equidigital number, since it uses as much as digits as its factorization.

31332120320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35641 (or 35627 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31332120320 its reverse (2302123313), we get a palindrome (33634243633).

The spelling of 31332120320 in words is "thirty-one billion, three hundred thirty-two million, one hundred twenty thousand, three hundred twenty".