20355312013500 has 96 divisors (see below), whose sum is σ = 59276744235072. Its totient is φ = 5427893126400.

The previous prime is 20355312013481. The next prime is 20355312013501. The reversal of 20355312013500 is 531021355302.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355312013501) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 45553162 + ... + 45997838.

It is an arithmetic number, because the mean of its divisors is an integer number (617466085782).

Almost surely, 2^{20355312013500} is an apocalyptic number.

20355312013500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20355312013500 is an abundant number, since it is smaller than the sum of its proper divisors (38921432221572).

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

20355312013500 is a wasteful number, since it uses less digits than its factorization.

20355312013500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475216 (or 475204 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 30.

Adding to 20355312013500 its reverse (531021355302), we get a palindrome (20886333368802).

The spelling of 20355312013500 in words is "twenty trillion, three hundred fifty-five billion, three hundred twelve million, thirteen thousand, five hundred".