31204344143420 has 96 divisors (see below), whose sum is σ = 76708941163008. Its totient is φ = 10439343597312.

The previous prime is 31204344143407. The next prime is 31204344143519. The reversal of 31204344143420 is 2434144340213.

It is a super-2 number, since 2×31204344143420² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3402419 + ... + 8601461.

It is an arithmetic number, because the mean of its divisors is an integer number (799051470448).

Almost surely, 2^{31204344143420} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31204344143420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38354470581504).

31204344143420 is an abundant number, since it is smaller than the sum of its proper divisors (45504597019588).

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

31204344143420 is a wasteful number, since it uses less digits than its factorization.

31204344143420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5200099 (or 5200097 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 31204344143420 its reverse (2434144340213), we get a palindrome (33638488483633).

The spelling of 31204344143420 in words is "thirty-one trillion, two hundred four billion, three hundred forty-four million, one hundred forty-three thousand, four hundred twenty".