31423312220 has 24 divisors (see below), whose sum is σ = 66973868304. Its totient is φ = 12381722496.

The previous prime is 31423312213. The next prime is 31423312243. The reversal of 31423312220 is 2221332413.

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, 11723777 + ... + 11726456.

It is an arithmetic number, because the mean of its divisors is an integer number (2790577846).

Almost surely, 2^31423312220 is an apocalyptic number.

It is an amenable number.

31423312220 is an abundant number, since it is smaller than the sum of its proper divisors (35550556084).

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

31423312220 is a wasteful number, since it uses less digits than its factorization.

31423312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23450309 (or 23450307 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31423312220 its reverse (2221332413), we get a palindrome (33644644633).

The spelling of 31423312220 in words is "thirty-one billion, four hundred twenty-three million, three hundred twelve thousand, two hundred twenty".