20730051 has 12 divisors (see below), whose sum is σ = 30674280. Its totient is φ = 13482720.

The previous prime is 20730037. The next prime is 20730053. The reversal of 20730051 is 15003702.

It is not a de Polignac number, because 20730051 - 2⁹ = 20729539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20730053) 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 11 ways as a sum of consecutive naturals, for example, 27721 + ... + 28458.

It is an arithmetic number, because the mean of its divisors is an integer number (2556190).

Almost surely, 2^20730051 is an apocalyptic number.

20730051 is a deficient number, since it is larger than the sum of its proper divisors (9944229).

20730051 is a wasteful number, since it uses less digits than its factorization.

20730051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56226 (or 56223 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20730051 is about 4553.0265758065. The cubic root of 20730051 is about 274.7051429182.

Adding to 20730051 its reverse (15003702), we get a palindrome (35733753).

The spelling of 20730051 in words is "twenty million, seven hundred thirty thousand, fifty-one".