31820665404 has 48 divisors (see below), whose sum is σ = 81086503680. Its totient is φ = 9632096640.

The previous prime is 31820665403. The next prime is 31820665427. The reversal of 31820665404 is 40456602813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31820665403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9849 + ... + 252464.

It is an arithmetic number, because the mean of its divisors is an integer number (1689302160).

Almost surely, 2^31820665404 is an apocalyptic number.

It is an amenable number.

31820665404 is an abundant number, since it is smaller than the sum of its proper divisors (49265838276).

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

31820665404 is a wasteful number, since it uses less digits than its factorization.

31820665404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263250 (or 263248 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 31820665404 in words is "thirty-one billion, eight hundred twenty million, six hundred sixty-five thousand, four hundred four".