20730403 has 8 divisors (see below), whose sum is σ = 21134672. Its totient is φ = 20329056.

The previous prime is 20730373. The next prime is 20730407. The reversal of 20730403 is 30403702.

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 20730403 - 2¹⁷ = 20599331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20730407) 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, 18001 + ... + 19117.

It is an arithmetic number, because the mean of its divisors is an integer number (2641834).

Almost surely, 2^20730403 is an apocalyptic number.

20730403 is a deficient number, since it is larger than the sum of its proper divisors (404269).

20730403 is a wasteful number, since it uses less digits than its factorization.

20730403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461.

The product of its (nonzero) digits is 504, while the sum is 19.

The square root of 20730403 is about 4553.0652312481. The cubic root of 20730403 is about 274.7066977570.

The spelling of 20730403 in words is "twenty million, seven hundred thirty thousand, four hundred three".