20730413 has 8 divisors (see below), whose sum is σ = 23344896. Its totient is φ = 18237600.

The previous prime is 20730407. The next prime is 20730421. The reversal of 20730413 is 31403702.

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 20730413 - 2¹⁰ = 20729389 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 (20730433) 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, 30056 + ... + 30737.

It is an arithmetic number, because the mean of its divisors is an integer number (2918112).

Almost surely, 2^20730413 is an apocalyptic number.

It is an amenable number.

20730413 is a deficient number, since it is larger than the sum of its proper divisors (2614483).

20730413 is a wasteful number, since it uses less digits than its factorization.

20730413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60835.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20730413 is about 4553.0663294092. The cubic root of 20730413 is about 274.7067419283.

Subtracting 20730413 from its reverse (31403702), we obtain a square (10673289 = 3267²).

The spelling of 20730413 in words is "twenty million, seven hundred thirty thousand, four hundred thirteen".