20326729 has 4 divisors (see below), whose sum is σ = 20463300. Its totient is φ = 20190160.

The previous prime is 20326723. The next prime is 20326759. The reversal of 20326729 is 92762302.

20326729 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1638400 + 18688329 = 1280^2 + 4323^2 .

It is a cyclic number.

It is not a de Polignac number, because 20326729 - 2³ = 20326721 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20326729.

It is not an unprimeable number, because it can be changed into a prime (20326721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68062 + ... + 68359.

It is an arithmetic number, because the mean of its divisors is an integer number (5115825).

Almost surely, 2^20326729 is an apocalyptic number.

It is an amenable number.

20326729 is a deficient number, since it is larger than the sum of its proper divisors (136571).

20326729 is a wasteful number, since it uses less digits than its factorization.

20326729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136570.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20326729 is about 4508.5173837970. The cubic root of 20326729 is about 272.9119163739.

The spelling of 20326729 in words is "twenty million, three hundred twenty-six thousand, seven hundred twenty-nine".