20257043601 has 4 divisors (see below), whose sum is σ = 27009391472. Its totient is φ = 13504695732.

The previous prime is 20257043581. The next prime is 20257043623. The reversal of 20257043601 is 10634075202.

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 not a de Polignac number, because 20257043601 - 2⁹ = 20257043089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20257043801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3376173931 + ... + 3376173936.

It is an arithmetic number, because the mean of its divisors is an integer number (6752347868).

Almost surely, 2^20257043601 is an apocalyptic number.

It is an amenable number.

20257043601 is a deficient number, since it is larger than the sum of its proper divisors (6752347871).

20257043601 is an equidigital number, since it uses as much as digits as its factorization.

20257043601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6752347870.

The product of its (nonzero) digits is 10080, while the sum is 30.

The spelling of 20257043601 in words is "twenty billion, two hundred fifty-seven million, forty-three thousand, six hundred one".