20321633332536 has 128 divisors (see below), whose sum is σ = 53685304243200. Its totient is φ = 6399811514880.

The previous prime is 20321633332457. The next prime is 20321633332537. The reversal of 20321633332536 is 63523333612302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321633332537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163857846 + ... + 163981818.

It is an arithmetic number, because the mean of its divisors is an integer number (419416439400).

Almost surely, 2^{20321633332536} 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 20321633332536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26842652121600).

20321633332536 is an abundant number, since it is smaller than the sum of its proper divisors (33363670910664).

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

20321633332536 is a wasteful number, since it uses less digits than its factorization.

20321633332536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129069 (or 129065 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 42.

Adding to 20321633332536 its reverse (63523333612302), we get a palindrome (83844966944838).

The spelling of 20321633332536 in words is "twenty trillion, three hundred twenty-one billion, six hundred thirty-three million, three hundred thirty-two thousand, five hundred thirty-six".