31020235420 has 48 divisors (see below), whose sum is σ = 65745792000. Its totient is φ = 12293709120.

The previous prime is 31020235403. The next prime is 31020235481. The reversal of 31020235420 is 2453202013.

It is a junction number, because it is equal to n+sod(n) for n = 31020235391 and 31020235400.

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, 934915 + ... + 967525.

It is an arithmetic number, because the mean of its divisors is an integer number (1369704000).

Almost surely, 2^31020235420 is an apocalyptic number.

It is an amenable number.

31020235420 is an abundant number, since it is smaller than the sum of its proper divisors (34725556580).

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

31020235420 is a wasteful number, since it uses less digits than its factorization.

31020235420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33058 (or 33056 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 31020235420 its reverse (2453202013), we get a palindrome (33473437433).

The spelling of 31020235420 in words is "thirty-one billion, twenty million, two hundred thirty-five thousand, four hundred twenty".