31080020 has 24 divisors (see below), whose sum is σ = 66376800. Its totient is φ = 12220832.

The previous prime is 31080017. The next prime is 31080031. The reversal of 31080020 is 2008013.

It is a junction number, because it is equal to n+sod(n) for n = 31079977 and 31080004.

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, 11990 + ... + 14349.

It is an arithmetic number, because the mean of its divisors is an integer number (2765700).

Almost surely, 2^31080020 is an apocalyptic number.

It is an amenable number.

31080020 is an abundant number, since it is smaller than the sum of its proper divisors (35296780).

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

31080020 is a wasteful number, since it uses less digits than its factorization.

31080020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26407 (or 26405 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 31080020 is about 5574.9457396463. The cubic root of 31080020 is about 314.4081268524.

Adding to 31080020 its reverse (2008013), we get a palindrome (33088033).

The spelling of 31080020 in words is "thirty-one million, eighty thousand, twenty".