20957648629247 has 8 divisors (see below), whose sum is σ = 22863200165760. Its totient is φ = 19052148884760.

The previous prime is 20957648629217. The next prime is 20957648629279. The reversal of 20957648629247 is 74292684675902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20957648629247 - 2¹⁶ = 20957648563711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957648629217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12099497 + ... + 13722722.

It is an arithmetic number, because the mean of its divisors is an integer number (2857900020720).

Almost surely, 2^{20957648629247} is an apocalyptic number.

20957648629247 is a deficient number, since it is larger than the sum of its proper divisors (1905551536513).

20957648629247 is a wasteful number, since it uses less digits than its factorization.

20957648629247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25896013.

The product of its (nonzero) digits is 731566080, while the sum is 71.

The spelling of 20957648629247 in words is "twenty trillion, nine hundred fifty-seven billion, six hundred forty-eight million, six hundred twenty-nine thousand, two hundred forty-seven".