20570457057 has 4 divisors (see below), whose sum is σ = 27427276080. Its totient is φ = 13713638036.

The previous prime is 20570457029. The next prime is 20570457067. The reversal of 20570457057 is 75075407502.

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 20570457057 - 2¹⁰ = 20570456033 is a prime.

It is a super-2 number, since 2×20570457057² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20570457067) 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, 3428409507 + ... + 3428409512.

It is an arithmetic number, because the mean of its divisors is an integer number (6856819020).

Almost surely, 2^20570457057 is an apocalyptic number.

It is an amenable number.

20570457057 is a deficient number, since it is larger than the sum of its proper divisors (6856819023).

20570457057 is an equidigital number, since it uses as much as digits as its factorization.

20570457057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856819022.

The product of its (nonzero) digits is 343000, while the sum is 42.

The spelling of 20570457057 in words is "twenty billion, five hundred seventy million, four hundred fifty-seven thousand, fifty-seven".