20321056536550 has 96 divisors (see below), whose sum is σ = 47266109132544. Its totient is φ = 6314699952000.

The previous prime is 20321056536533. The next prime is 20321056536623. The reversal of 20321056536550 is 5563565012302.

It is a super-2 number, since 2×20321056536550² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20321056536497 and 20321056536506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6698757 + ... + 9247456.

It is an arithmetic number, because the mean of its divisors is an integer number (492355303464).

Almost surely, 2^{20321056536550} is an apocalyptic number.

20321056536550 is an abundant number, since it is smaller than the sum of its proper divisors (26945052595994).

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

20321056536550 is a wasteful number, since it uses less digits than its factorization.

20321056536550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15946574 (or 15946569 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 43.

The spelling of 20321056536550 in words is "twenty trillion, three hundred twenty-one billion, fifty-six million, five hundred thirty-six thousand, five hundred fifty".