20538057057457 has 4 divisors (see below), whose sum is σ = 20610629697520. Its totient is φ = 20465484417396.

The previous prime is 20538057057451. The next prime is 20538057057481. The reversal of 20538057057457 is 75475075083502.

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 20538057057457 - 2³ = 20538057057449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20538057057451) 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, 36286319607 + ... + 36286320172.

It is an arithmetic number, because the mean of its divisors is an integer number (5152657424380).

Almost surely, 2^{20538057057457} is an apocalyptic number.

It is an amenable number.

20538057057457 is a deficient number, since it is larger than the sum of its proper divisors (72572640063).

20538057057457 is an equidigital number, since it uses as much as digits as its factorization.

20538057057457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72572640062.

The product of its (nonzero) digits is 41160000, while the sum is 58.

The spelling of 20538057057457 in words is "twenty trillion, five hundred thirty-eight billion, fifty-seven million, fifty-seven thousand, four hundred fifty-seven".