31320497317820 has 24 divisors (see below), whose sum is σ = 65774305304064. Its totient is φ = 12527958748736.

The previous prime is 31320497317777. The next prime is 31320497317843. The reversal of 31320497317820 is 2871379402313.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13939964 + ... + 16030083.

It is an arithmetic number, because the mean of its divisors is an integer number (2740596054336).

Almost surely, 2^{31320497317820} is an apocalyptic number.

It is an amenable number.

31320497317820 is an abundant number, since it is smaller than the sum of its proper divisors (34453807986244).

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

31320497317820 is a wasteful number, since it uses less digits than its factorization.

31320497317820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30022309 (or 30022307 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 31320497317820 in words is "thirty-one trillion, three hundred twenty billion, four hundred ninety-seven million, three hundred seventeen thousand, eight hundred twenty".