31440143220 has 48 divisors (see below), whose sum is σ = 92665688640. Its totient is φ = 7942772736.

The previous prime is 31440143209. The next prime is 31440143243. The reversal of 31440143220 is 2234104413.

It is a super-2 number, since 2×31440143220² (a number of 22 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 13788397 + ... + 13790676.

It is an arithmetic number, because the mean of its divisors is an integer number (1930535180).

Almost surely, 2^31440143220 is an apocalyptic number.

31440143220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31440143220 is an abundant number, since it is smaller than the sum of its proper divisors (61225545420).

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

31440143220 is a wasteful number, since it uses less digits than its factorization.

31440143220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27579104 (or 27579102 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31440143220 its reverse (2234104413), we get a palindrome (33674247633).

The spelling of 31440143220 in words is "thirty-one billion, four hundred forty million, one hundred forty-three thousand, two hundred twenty".