31675220020 has 24 divisors (see below), whose sum is σ = 67203718344. Its totient is φ = 12539467776.

The previous prime is 31675219991. The next prime is 31675220039. The reversal of 31675220020 is 2002257613.

It can be written as a sum of positive squares in 4 ways, for example, as 6170256 + 31669049764 = 2484^2 + 177958^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8161777 + ... + 8165656.

It is an arithmetic number, because the mean of its divisors is an integer number (2800154931).

Almost surely, 2^31675220020 is an apocalyptic number.

It is an amenable number.

31675220020 is an abundant number, since it is smaller than the sum of its proper divisors (35528498324).

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

31675220020 is a wasteful number, since it uses less digits than its factorization.

31675220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16327539 (or 16327537 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 31675220020 its reverse (2002257613), we get a palindrome (33677477633).

It can be divided in two parts, 31675 and 220020, that added together give a triangular number (251695 = T₇₀₉).

The spelling of 31675220020 in words is "thirty-one billion, six hundred seventy-five million, two hundred twenty thousand, twenty".