20730503 has 8 divisors (see below), whose sum is σ = 21106800. Its totient is φ = 20357568.

The previous prime is 20730491. The next prime is 20730529. The reversal of 20730503 is 30503702.

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 20730503 - 2⁶ = 20730439 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 (20730533) 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, 13793 + ... + 15221.

It is an arithmetic number, because the mean of its divisors is an integer number (2638350).

Almost surely, 2^20730503 is an apocalyptic number.

20730503 is a deficient number, since it is larger than the sum of its proper divisors (376297).

20730503 is a wasteful number, since it uses less digits than its factorization.

20730503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681.

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

The square root of 20730503 is about 4553.0762128477. The cubic root of 20730503 is about 274.7071394693.

The spelling of 20730503 in words is "twenty million, seven hundred thirty thousand, five hundred three".