31031043020 has 24 divisors (see below), whose sum is σ = 65837000544. Its totient is φ = 12284453376.

The previous prime is 31031043019. The next prime is 31031043023. The reversal of 31031043020 is 2034013013.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31031043020.

It is not an unprimeable number, because it can be changed into a prime (31031043023) 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 7 ways as a sum of consecutive naturals, for example, 7995752 + ... + 7999631.

It is an arithmetic number, because the mean of its divisors is an integer number (2743208356).

Almost surely, 2^31031043020 is an apocalyptic number.

It is an amenable number.

31031043020 is an abundant number, since it is smaller than the sum of its proper divisors (34805957524).

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

31031043020 is a wasteful number, since it uses less digits than its factorization.

31031043020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15995489 (or 15995487 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31031043020 its reverse (2034013013), we get a palindrome (33065056033).

The spelling of 31031043020 in words is "thirty-one billion, thirty-one million, forty-three thousand, twenty".