31320020223 has 64 divisors (see below), whose sum is σ = 51491635200. Its totient is φ = 18735222240.

The previous prime is 31320020219. The next prime is 31320020243. The reversal of 31320020223 is 32202002313.

It is a happy number.

It is not a de Polignac number, because 31320020223 - 2² = 31320020219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31320020196 and 31320020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320020243) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 726490 + ... + 768392.

It is an arithmetic number, because the mean of its divisors is an integer number (804556800).

Almost surely, 2^31320020223 is an apocalyptic number.

31320020223 is a deficient number, since it is larger than the sum of its proper divisors (20171614977).

31320020223 is a wasteful number, since it uses less digits than its factorization.

31320020223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42009 (or 42003 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 31320020223 its reverse (32202002313), we get a palindrome (63522022536).

The spelling of 31320020223 in words is "thirty-one billion, three hundred twenty million, twenty thousand, two hundred twenty-three".