20570051 has 4 divisors (see below), whose sum is σ = 21780072. Its totient is φ = 19360032.

The previous prime is 20570041. The next prime is 20570057. The reversal of 20570051 is 15007502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15007502 = 2 ⋅7503751.

It is a cyclic number.

It is not a de Polignac number, because 20570051 - 2¹⁸ = 20307907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20570057) 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, 604985 + ... + 605018.

It is an arithmetic number, because the mean of its divisors is an integer number (5445018).

Almost surely, 2^20570051 is an apocalyptic number.

20570051 is a deficient number, since it is larger than the sum of its proper divisors (1210021).

20570051 is a wasteful number, since it uses less digits than its factorization.

20570051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210020.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 20570051 is about 4535.4218105927. The cubic root of 20570051 is about 273.9965678793.

Adding to 20570051 its reverse (15007502), we get a palindrome (35577553).

The spelling of 20570051 in words is "twenty million, five hundred seventy thousand, fifty-one".