20355012521173 has 8 divisors (see below), whose sum is σ = 22434390558720. Its totient is φ = 18313788209280.

The previous prime is 20355012521171. The next prime is 20355012521183. The reversal of 20355012521173 is 37112521055302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20355012521173 - 2¹ = 20355012521171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355012521171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9538430293 + ... + 9538432426.

It is an arithmetic number, because the mean of its divisors is an integer number (2804298819840).

Almost surely, 2^{20355012521173} is an apocalyptic number.

It is an amenable number.

20355012521173 is a deficient number, since it is larger than the sum of its proper divisors (2079378037547).

20355012521173 is a wasteful number, since it uses less digits than its factorization.

20355012521173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19076862827.

The product of its (nonzero) digits is 63000, while the sum is 37.

Adding to 20355012521173 its reverse (37112521055302), we get a palindrome (57467533576475).

The spelling of 20355012521173 in words is "twenty trillion, three hundred fifty-five billion, twelve million, five hundred twenty-one thousand, one hundred seventy-three".