20003573 has 4 divisors (see below), whose sum is σ = 20019180. Its totient is φ = 19987968.

The previous prime is 20003567. The next prime is 20003597. The reversal of 20003573 is 37530002.

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 10125124 + 9878449 = 3182^2 + 3143^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003573 - 2⁸ = 20003317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20003513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5690 + ... + 8507.

It is an arithmetic number, because the mean of its divisors is an integer number (5004795).

Almost surely, 2^20003573 is an apocalyptic number.

It is an amenable number.

20003573 is a deficient number, since it is larger than the sum of its proper divisors (15607).

20003573 is a wasteful number, since it uses less digits than its factorization.

20003573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606.

The product of its (nonzero) digits is 630, while the sum is 20.

The square root of 20003573 is about 4472.5354107039. The cubic root of 20003573 is about 271.4579250539.

Adding to 20003573 its reverse (37530002), we get a palindrome (57533575).

The spelling of 20003573 in words is "twenty million, three thousand, five hundred seventy-three".