20570669 has 4 divisors (see below), whose sum is σ = 23509344. Its totient is φ = 17631996.

The previous prime is 20570653. The next prime is 20570677. The reversal of 20570669 is 96607502.

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 20570669 - 2⁴ = 20570653 is a prime.

It is a super-2 number, since 2×20570669² = 846304846215122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20570609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1469327 + ... + 1469340.

It is an arithmetic number, because the mean of its divisors is an integer number (5877336).

Almost surely, 2^20570669 is an apocalyptic number.

It is an amenable number.

20570669 is a deficient number, since it is larger than the sum of its proper divisors (2938675).

20570669 is an equidigital number, since it uses as much as digits as its factorization.

20570669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938674.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 20570669 is about 4535.4899404585. The cubic root of 20570669 is about 273.9993118068. Note that the first 3 decimals are identical.

The spelling of 20570669 in words is "twenty million, five hundred seventy thousand, six hundred sixty-nine".