31302013220 has 48 divisors (see below), whose sum is σ = 69343760640. Its totient is φ = 11836129536.

The previous prime is 31302013213. The next prime is 31302013229. The reversal of 31302013220 is 2231020313.

It is not an unprimeable number, because it can be changed into a prime (31302013229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86984 + ... + 264896.

It is an arithmetic number, because the mean of its divisors is an integer number (1444661680).

Almost surely, 2^31302013220 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 31302013220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34671880320).

31302013220 is an abundant number, since it is smaller than the sum of its proper divisors (38041747420).

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

31302013220 is a wasteful number, since it uses less digits than its factorization.

31302013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178404 (or 178402 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31302013220 its reverse (2231020313), we get a palindrome (33533033533).

The spelling of 31302013220 in words is "thirty-one billion, three hundred two million, thirteen thousand, two hundred twenty".