20010729 has 4 divisors (see below), whose sum is σ = 26680976. Its totient is φ = 13340484.

The previous prime is 20010721. The next prime is 20010763. The reversal of 20010729 is 92701002.

It is a happy number.

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 not a de Polignac number, because 20010729 - 2³ = 20010721 is a prime.

It is a super-2 number, since 2×20010729² = 800858550222882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20010721) 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, 3335119 + ... + 3335124.

It is an arithmetic number, because the mean of its divisors is an integer number (6670244).

Almost surely, 2^20010729 is an apocalyptic number.

It is an amenable number.

20010729 is a deficient number, since it is larger than the sum of its proper divisors (6670247).

20010729 is an equidigital number, since it uses as much as digits as its factorization.

20010729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670246.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20010729 is about 4473.3353328361. The cubic root of 20010729 is about 271.4902912936.

The spelling of 20010729 in words is "twenty million, ten thousand, seven hundred twenty-nine".