31320020205 has 24 divisors (see below), whose sum is σ = 54484042392. Its totient is φ = 16643700864.

The previous prime is 31320020191. The next prime is 31320020219. The reversal of 31320020205 is 50202002313.

It is an interprime number because it is at equal distance from previous prime (31320020191) and next prime (31320020219).

It can be written as a sum of positive squares in 4 ways, for example, as 243266409 + 31076753796 = 15597^2 + 176286^2 .

It is not a de Polignac number, because 31320020205 - 2⁷ = 31320020077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1243854 + ... + 1268783.

It is an arithmetic number, because the mean of its divisors is an integer number (2270168433).

Almost surely, 2^31320020205 is an apocalyptic number.

It is an amenable number.

31320020205 is a deficient number, since it is larger than the sum of its proper divisors (23164022187).

31320020205 is a wasteful number, since it uses less digits than its factorization.

31320020205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512925 (or 2512922 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

Adding to 31320020205 its reverse (50202002313), we get a palindrome (81522022518).

The spelling of 31320020205 in words is "thirty-one billion, three hundred twenty million, twenty thousand, two hundred five".