20569929 has 4 divisors (see below), whose sum is σ = 27426576. Its totient is φ = 13713284.

The previous prime is 20569877. The next prime is 20569933. The reversal of 20569929 is 92996502.

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 20569929 - 2²⁰ = 19521353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20569999) 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, 3428319 + ... + 3428324.

It is an arithmetic number, because the mean of its divisors is an integer number (6856644).

Almost surely, 2^20569929 is an apocalyptic number.

It is an amenable number.

20569929 is a deficient number, since it is larger than the sum of its proper divisors (6856647).

20569929 is an equidigital number, since it uses as much as digits as its factorization.

20569929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6856646.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 20569929 is about 4535.4083608866. The cubic root of 20569929 is about 273.9960261913.

The spelling of 20569929 in words is "twenty million, five hundred sixty-nine thousand, nine hundred twenty-nine".