20659309881344 has 384 divisors, whose sum is σ = 46164174376320. Its totient is φ = 9201581555712.

The previous prime is 20659309881337. The next prime is 20659309881433. The reversal of 20659309881344 is 44318890395602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6585688544 + ... + 6585691680.

It is an arithmetic number, because the mean of its divisors is an integer number (120219204105).

Almost surely, 2^{20659309881344} 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 20659309881344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23082087188160).

20659309881344 is an abundant number, since it is smaller than the sum of its proper divisors (25504864494976).

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

20659309881344 is a wasteful number, since it uses less digits than its factorization.

20659309881344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355 (or 3335 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 62.

The spelling of 20659309881344 in words is "twenty trillion, six hundred fifty-nine billion, three hundred nine million, eight hundred eighty-one thousand, three hundred forty-four".