20344458257 has 8 divisors (see below), whose sum is σ = 21288414720. Its totient is φ = 19418482080.

The previous prime is 20344458227. The next prime is 20344458269. The reversal of 20344458257 is 75285444302.

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 20344458257 - 2⁶ = 20344458193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20344458227) 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, 4492757 + ... + 4497282.

It is an arithmetic number, because the mean of its divisors is an integer number (2661051840).

Almost surely, 2^20344458257 is an apocalyptic number.

It is an amenable number.

20344458257 is a deficient number, since it is larger than the sum of its proper divisors (943956463).

20344458257 is an equidigital number, since it uses as much as digits as its factorization.

20344458257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8990143.

The product of its (nonzero) digits is 1075200, while the sum is 44.

The spelling of 20344458257 in words is "twenty billion, three hundred forty-four million, four hundred fifty-eight thousand, two hundred fifty-seven".