20791573 has 8 divisors (see below), whose sum is σ = 22762656. Its totient is φ = 18834000.

The previous prime is 20791559. The next prime is 20791613. The reversal of 20791573 is 37519702.

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 20791573 - 2¹⁷ = 20660501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20791513) 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 7 ways as a sum of consecutive naturals, for example, 3 + ... + 6448.

It is an arithmetic number, because the mean of its divisors is an integer number (2845332).

Almost surely, 2^20791573 is an apocalyptic number.

It is an amenable number.

20791573 is a deficient number, since it is larger than the sum of its proper divisors (1971083).

20791573 is a wasteful number, since it uses less digits than its factorization.

20791573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6755.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 20791573 is about 4559.7777358113. Note that the first 4 decimals coincide. The cubic root of 20791573 is about 274.9766283168.

The spelling of 20791573 in words is "twenty million, seven hundred ninety-one thousand, five hundred seventy-three".