20730723 has 24 divisors (see below), whose sum is σ = 30919680. Its totient is φ = 12336480.

The previous prime is 20730719. The next prime is 20730733. The reversal of 20730723 is 32703702.

It is not a de Polignac number, because 20730723 - 2² = 20730719 is a prime.

It is a super-2 number, since 2×20730723² = 859525752205458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20730693 and 20730702.

It is not an unprimeable number, because it can be changed into a prime (20730733) 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 23 ways as a sum of consecutive naturals, for example, 15058 + ... + 16376.

It is an arithmetic number, because the mean of its divisors is an integer number (1288320).

Almost surely, 2^20730723 is an apocalyptic number.

20730723 is a deficient number, since it is larger than the sum of its proper divisors (10188957).

20730723 is a wasteful number, since it uses less digits than its factorization.

20730723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 24.

The square root of 20730723 is about 4553.1003722738. The cubic root of 20730723 is about 274.7081112315.

The spelling of 20730723 in words is "twenty million, seven hundred thirty thousand, seven hundred twenty-three".