20191705952257 has 32 divisors (see below), whose sum is σ = 23377636638720. Its totient is φ = 17082318052800.

The previous prime is 20191705952251. The next prime is 20191705952279. The reversal of 20191705952257 is 75225950719102.

It is not a de Polignac number, because 20191705952257 - 2²³ = 20191697563649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20191705952198 and 20191705952207.

It is not an unprimeable number, because it can be changed into a prime (20191705952251) 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 31 ways as a sum of consecutive naturals, for example, 330163632 + ... + 330224782.

It is an arithmetic number, because the mean of its divisors is an integer number (730551144960).

Almost surely, 2^{20191705952257} is an apocalyptic number.

It is an amenable number.

20191705952257 is a deficient number, since it is larger than the sum of its proper divisors (3185930686463).

20191705952257 is a wasteful number, since it uses less digits than its factorization.

20191705952257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62773.

The product of its (nonzero) digits is 3969000, while the sum is 55.

The spelling of 20191705952257 in words is "twenty trillion, one hundred ninety-one billion, seven hundred five million, nine hundred fifty-two thousand, two hundred fifty-seven".