31443120040020 has 48 divisors (see below), whose sum is σ = 94813100430720. Its totient is φ = 7739844932736.

The previous prime is 31443120040001. The next prime is 31443120040121. The reversal of 31443120040020 is 2004002134413.

It is a super-2 number, since 2×31443120040020² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20155845400 + ... + 20155846959.

It is an arithmetic number, because the mean of its divisors is an integer number (1975272925640).

Almost surely, 2^{31443120040020} is an apocalyptic number.

31443120040020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31443120040020 is an abundant number, since it is smaller than the sum of its proper divisors (63369980390700).

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

31443120040020 is a wasteful number, since it uses less digits than its factorization.

31443120040020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40311692384 (or 40311692382 counting only the distinct ones).

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

Adding to 31443120040020 its reverse (2004002134413), we get a palindrome (33447122174433).

The spelling of 31443120040020 in words is "thirty-one trillion, four hundred forty-three billion, one hundred twenty million, forty thousand, twenty".