31033320020 has 24 divisors (see below), whose sum is σ = 66399596424. Its totient is φ = 12179113856.

The previous prime is 31033319983. The next prime is 31033320041. The reversal of 31033320020 is 2002333013.

It can be written as a sum of positive squares in 4 ways, for example, as 733651396 + 30299668624 = 27086^2 + 174068^2 .

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 7 ways as a sum of consecutive naturals, for example, 14637299 + ... + 14639418.

It is an arithmetic number, because the mean of its divisors is an integer number (2766649851).

Almost surely, 2^31033320020 is an apocalyptic number.

It is an amenable number.

31033320020 is an abundant number, since it is smaller than the sum of its proper divisors (35366276404).

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

31033320020 is a wasteful number, since it uses less digits than its factorization.

31033320020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29276779 (or 29276777 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 17.

Adding to 31033320020 its reverse (2002333013), we get a palindrome (33035653033).

The spelling of 31033320020 in words is "thirty-one billion, thirty-three million, three hundred twenty thousand, twenty".