20730215 has 32 divisors (see below), whose sum is σ = 28848960. Its totient is φ = 14156800.

The previous prime is 20730187. The next prime is 20730217. The reversal of 20730215 is 51203702.

It is not a de Polignac number, because 20730215 - 2¹² = 20726119 is a prime.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65237 + ... + 65553.

It is an arithmetic number, because the mean of its divisors is an integer number (901530).

Almost surely, 2^20730215 is an apocalyptic number.

20730215 is a deficient number, since it is larger than the sum of its proper divisors (8118745).

20730215 is a wasteful number, since it uses less digits than its factorization.

20730215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20730215 is about 4553.0445857690. The cubic root of 20730215 is about 274.7058673339.

Adding to 20730215 its reverse (51203702), we get a palindrome (71933917).

The spelling of 20730215 in words is "twenty million, seven hundred thirty thousand, two hundred fifteen".