20031315355520 has 128 divisors (see below), whose sum is σ = 54780010084800. Its totient is φ = 6861404897280.

The previous prime is 20031315355483. The next prime is 20031315355529. The reversal of 20031315355520 is 2555351313002.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031315355529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2646176 + ... + 6860384.

Almost surely, 2^{20031315355520} is an apocalyptic number.

20031315355520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20031315355520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27390005042400).

20031315355520 is an abundant number, since it is smaller than the sum of its proper divisors (34748694729280).

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

20031315355520 is a wasteful number, since it uses less digits than its factorization.

20031315355520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215296 (or 4215284 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 35.

Adding to 20031315355520 its reverse (2555351313002), we get a palindrome (22586666668522).

The spelling of 20031315355520 in words is "twenty trillion, thirty-one billion, three hundred fifteen million, three hundred fifty-five thousand, five hundred twenty".