31120200320 has 256 divisors, whose sum is σ = 85938019200. Its totient is φ = 10657382400.

The previous prime is 31120200317. The next prime is 31120200367. The reversal of 31120200320 is 2300202113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31120200295 and 31120200304.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26350130 + ... + 26351310.

Almost surely, 2^31120200320 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 31120200320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42969009600).

31120200320 is an abundant number, since it is smaller than the sum of its proper divisors (54817818880).

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

31120200320 is a wasteful number, since it uses less digits than its factorization.

31120200320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427 (or 1415 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31120200320 its reverse (2300202113), we get a palindrome (33420402433).

The spelling of 31120200320 in words is "thirty-one billion, one hundred twenty million, two hundred thousand, three hundred twenty".