20245729 has 8 divisors (see below), whose sum is σ = 23215808. Its totient is φ = 17295120.

The previous prime is 20245711. The next prime is 20245739. The reversal of 20245729 is 92754202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20245729 - 2¹¹ = 20243681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20245729.

It is not an unprimeable number, because it can be changed into a prime (20245739) 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 7 ways as a sum of consecutive naturals, for example, 2562 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (2901976).

Almost surely, 2^20245729 is an apocalyptic number.

It is an amenable number.

20245729 is a deficient number, since it is larger than the sum of its proper divisors (2970079).

20245729 is an equidigital number, since it uses as much as digits as its factorization.

20245729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9735.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20245729 is about 4499.5254194193. The cubic root of 20245729 is about 272.5489248069.

The spelling of 20245729 in words is "twenty million, two hundred forty-five thousand, seven hundred twenty-nine".