20639565207750 has 128 divisors (see below), whose sum is σ = 51724896537600. Its totient is φ = 5481614304000.

The previous prime is 20639565207739. The next prime is 20639565207757. The reversal of 20639565207750 is 5770256593602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639565207757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1005767490 + ... + 1005788010.

It is an arithmetic number, because the mean of its divisors is an integer number (404100754200).

Almost surely, 2^{20639565207750} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20639565207750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25862448268800).

20639565207750 is an abundant number, since it is smaller than the sum of its proper divisors (31085331329850).

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

20639565207750 is a wasteful number, since it uses less digits than its factorization.

20639565207750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25903 (or 25893 counting only the distinct ones).

The product of its (nonzero) digits is 23814000, while the sum is 57.

The spelling of 20639565207750 in words is "twenty trillion, six hundred thirty-nine billion, five hundred sixty-five million, two hundred seven thousand, seven hundred fifty".