31312020004 has 12 divisors (see below), whose sum is σ = 55025308800. Its totient is φ = 15590503208.

The previous prime is 31312020001. The next prime is 31312020017. The reversal of 31312020004 is 40002021313.

It is a happy number.

It is a super-3 number, since 3×31312020004³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31312020004.

It is not an unprimeable number, because it can be changed into a prime (31312020001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16375624 + ... + 16377535.

It is an arithmetic number, because the mean of its divisors is an integer number (4585442400).

Almost surely, 2^31312020004 is an apocalyptic number.

It is an amenable number.

31312020004 is a deficient number, since it is larger than the sum of its proper divisors (23713288796).

31312020004 is a wasteful number, since it uses less digits than its factorization.

31312020004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32753402 (or 32753400 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31312020004 its reverse (40002021313), we get a palindrome (71314041317).

The spelling of 31312020004 in words is "thirty-one billion, three hundred twelve million, twenty thousand, four".