20191705952256 has 156 divisors (see below), whose sum is σ = 58523565362808. Its totient is φ = 6707593838592.

The previous prime is 20191705952251. The next prime is 20191705952279. The reversal of 20191705952256 is 65225950719102.

20191705952256 is a `hidden beast` number, since 2 + 0 + 1 + 9 + 17 + 0 + 59 + 522 + 56 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20191705952251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9866451 + ... + 11735853.

It is an arithmetic number, because the mean of its divisors is an integer number (375151060018).

Almost surely, 2^{20191705952256} 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 20191705952256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29261782681404).

20191705952256 is an abundant number, since it is smaller than the sum of its proper divisors (38331859410552).

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

20191705952256 is a wasteful number, since it uses less digits than its factorization.

20191705952256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869726 (or 1869701 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 54.

The spelling of 20191705952256 in words is "twenty trillion, one hundred ninety-one billion, seven hundred five million, nine hundred fifty-two thousand, two hundred fifty-six".