20257660460263 has 4 divisors (see below), whose sum is σ = 20911133378368. Its totient is φ = 19604187542160.

The previous prime is 20257660460243. The next prime is 20257660460269. The reversal of 20257660460263 is 36206406675202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20257660460263 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 (20257660460269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326736459006 + ... + 326736459067.

It is an arithmetic number, because the mean of its divisors is an integer number (5227783344592).

Almost surely, 2^{20257660460263} is an apocalyptic number.

20257660460263 is a deficient number, since it is larger than the sum of its proper divisors (653472918105).

20257660460263 is an equidigital number, since it uses as much as digits as its factorization.

20257660460263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653472918104.

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 20257660460263 in words is "twenty trillion, two hundred fifty-seven billion, six hundred sixty million, four hundred sixty thousand, two hundred sixty-three".