20573729 has 8 divisors (see below), whose sum is σ = 22476960. Its totient is φ = 18676000.

The previous prime is 20573719. The next prime is 20573743. The reversal of 20573729 is 92737502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20573729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20573719) 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, 13454 + ... + 14904.

It is an arithmetic number, because the mean of its divisors is an integer number (2809620).

Almost surely, 2^20573729 is an apocalyptic number.

It is an amenable number.

20573729 is a deficient number, since it is larger than the sum of its proper divisors (1903231).

20573729 is a wasteful number, since it uses less digits than its factorization.

20573729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 20573729 is about 4535.8272674342. The cubic root of 20573729 is about 274.0128974340.

The spelling of 20573729 in words is "twenty million, five hundred seventy-three thousand, seven hundred twenty-nine".