31401305620 has 48 divisors (see below), whose sum is σ = 66264237648. Its totient is φ = 12499435520.

The previous prime is 31401305597. The next prime is 31401305627. The reversal of 31401305620 is 2650310413.

It can be written as a sum of positive squares in 8 ways, for example, as 2883204 + 31398422416 = 1698^2 + 177196^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401305627) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3673992 + ... + 3682528.

It is an arithmetic number, because the mean of its divisors is an integer number (1380504951).

Almost surely, 2^31401305620 is an apocalyptic number.

It is an amenable number.

31401305620 is an abundant number, since it is smaller than the sum of its proper divisors (34862932028).

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

31401305620 is a wasteful number, since it uses less digits than its factorization.

31401305620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420 (or 9418 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The spelling of 31401305620 in words is "thirty-one billion, four hundred one million, three hundred five thousand, six hundred twenty".