20570047 has 4 divisors (see below), whose sum is σ = 20636080. Its totient is φ = 20504016.

The previous prime is 20570041. The next prime is 20570057. The reversal of 20570047 is 74007502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74007502 = 2 ⋅37003751.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20570047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20570041) 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, 32547 + ... + 33172.

It is an arithmetic number, because the mean of its divisors is an integer number (5159020).

Almost surely, 2^20570047 is an apocalyptic number.

20570047 is a deficient number, since it is larger than the sum of its proper divisors (66033).

20570047 is an equidigital number, since it uses as much as digits as its factorization.

20570047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66032.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20570047 is about 4535.4213696194. The cubic root of 20570047 is about 273.9965501191.

Adding to 20570047 its reverse (74007502), we get a palindrome (94577549).

The spelling of 20570047 in words is "twenty million, five hundred seventy thousand, forty-seven".