31319856420 has 48 divisors (see below), whose sum is σ = 87727510080. Its totient is φ = 8348922496.

The previous prime is 31319856413. The next prime is 31319856433. The reversal of 31319856420 is 2465891313.

It is an unprimeable number.

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, 73759 + ... + 260921.

It is an arithmetic number, because the mean of its divisors is an integer number (1827656460).

Almost surely, 2^31319856420 is an apocalyptic number.

31319856420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31319856420 is an abundant number, since it is smaller than the sum of its proper divisors (56407653660).

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

31319856420 is a wasteful number, since it uses less digits than its factorization.

31319856420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189964 (or 189962 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 31319856420 in words is "thirty-one billion, three hundred nineteen million, eight hundred fifty-six thousand, four hundred twenty".