20730213 has 24 divisors (see below), whose sum is σ = 34372416. Its totient is φ = 11793600.

The previous prime is 20730187. The next prime is 20730217. The reversal of 20730213 is 31203702.

It is not a de Polignac number, because 20730213 - 2⁹ = 20729701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17118 + ... + 18288.

It is an arithmetic number, because the mean of its divisors is an integer number (1432184).

Almost surely, 2^20730213 is an apocalyptic number.

It is an amenable number.

20730213 is a deficient number, since it is larger than the sum of its proper divisors (13642203).

20730213 is a wasteful number, since it uses less digits than its factorization.

20730213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465 (or 1462 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 20730213 is about 4553.0443661357. The cubic root of 20730213 is about 274.7058584996.

Adding to 20730213 its reverse (31203702), we get a palindrome (51933915).

The spelling of 20730213 in words is "twenty million, seven hundred thirty thousand, two hundred thirteen".