31020130320 has 160 divisors (see below), whose sum is σ = 97263203328. Its totient is φ = 8177677824.

The previous prime is 31020130319. The next prime is 31020130321. The reversal of 31020130320 is 2303102013.

It is an interprime number because it is at equal distance from previous prime (31020130319) and next prime (31020130321).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31020130320.

It is not an unprimeable number, because it can be changed into a prime (31020130321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16614027 + ... + 16615893.

Almost surely, 2^31020130320 is an apocalyptic number.

31020130320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31020130320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48631601664).

31020130320 is an abundant number, since it is smaller than the sum of its proper divisors (66243073008).

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

31020130320 is a wasteful number, since it uses less digits than its factorization.

31020130320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637 (or 2631 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 31020130320 its reverse (2303102013), we get a palindrome (33323232333).

The spelling of 31020130320 in words is "thirty-one billion, twenty million, one hundred thirty thousand, three hundred twenty".