20081273257 has 4 divisors (see below), whose sum is σ = 20268948816. Its totient is φ = 19893597700.

The previous prime is 20081273249. The next prime is 20081273263. The reversal of 20081273257 is 75237218002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20081273257 - 2³ = 20081273249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20081273207) 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, 93837619 + ... + 93837832.

It is an arithmetic number, because the mean of its divisors is an integer number (5067237204).

Almost surely, 2^20081273257 is an apocalyptic number.

It is an amenable number.

20081273257 is a deficient number, since it is larger than the sum of its proper divisors (187675559).

20081273257 is a wasteful number, since it uses less digits than its factorization.

20081273257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187675558.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 20081273257 in words is "twenty billion, eighty-one million, two hundred seventy-three thousand, two hundred fifty-seven".