20085729 has 8 divisors (see below), whose sum is σ = 27180960. Its totient is φ = 13190496.

The previous prime is 20085727. The next prime is 20085733. The reversal of 20085729 is 92758002.

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

It is not a de Polignac number, because 20085729 - 2¹ = 20085727 is a prime.

It is a super-2 number, since 2×20085729² = 806873018922882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20085729.

It is not an unprimeable number, because it can be changed into a prime (20085727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49764 + ... + 50165.

It is an arithmetic number, because the mean of its divisors is an integer number (3397620).

Almost surely, 2^20085729 is an apocalyptic number.

It is an amenable number.

20085729 is a deficient number, since it is larger than the sum of its proper divisors (7095231).

20085729 is an equidigital number, since it uses as much as digits as its factorization.

20085729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99999.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 20085729 is about 4481.7104993518. The cubic root of 20085729 is about 271.8290493355.

The spelling of 20085729 in words is "twenty million, eighty-five thousand, seven hundred twenty-nine".