31340204352520 has 128 divisors (see below), whose sum is σ = 81959048294400. Its totient is φ = 10562570678016.

The previous prime is 31340204352511. The next prime is 31340204352547. The reversal of 31340204352520 is 2525340204313.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 493304997 + ... + 493368523.

It is an arithmetic number, because the mean of its divisors is an integer number (640305064800).

Almost surely, 2^{31340204352520} 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 31340204352520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40979524147200).

31340204352520 is an abundant number, since it is smaller than the sum of its proper divisors (50618843941880).

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

31340204352520 is a wasteful number, since it uses less digits than its factorization.

31340204352520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93467 (or 93463 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 34.

Adding to 31340204352520 its reverse (2525340204313), we get a palindrome (33865544556833).

The spelling of 31340204352520 in words is "thirty-one trillion, three hundred forty billion, two hundred four million, three hundred fifty-two thousand, five hundred twenty".