20724573 has 8 divisors (see below), whose sum is σ = 29087200. Its totient is φ = 13089168.

The previous prime is 20724569. The next prime is 20724601. The reversal of 20724573 is 37542702.

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

It is not a de Polignac number, because 20724573 - 2² = 20724569 is a prime.

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 20724573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724553) 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, 181738 + ... + 181851.

It is an arithmetic number, because the mean of its divisors is an integer number (3635900).

Almost surely, 2^20724573 is an apocalyptic number.

It is an amenable number.

20724573 is a deficient number, since it is larger than the sum of its proper divisors (8362627).

20724573 is a wasteful number, since it uses less digits than its factorization.

20724573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363611.

The product of its (nonzero) digits is 11760, while the sum is 30.

The square root of 20724573 is about 4552.4249581954. The cubic root of 20724573 is about 274.6809434706.

The spelling of 20724573 in words is "twenty million, seven hundred twenty-four thousand, five hundred seventy-three".