20730023 has 4 divisors (see below), whose sum is σ = 20744880. Its totient is φ = 20715168.

The previous prime is 20730011. The next prime is 20730037. The reversal of 20730023 is 32003702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32003702 = 2 ⋅16001851.

It is a cyclic number.

It is not a de Polignac number, because 20730023 - 2¹⁰ = 20728999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20729983 and 20730010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5090 + ... + 8207.

It is an arithmetic number, because the mean of its divisors is an integer number (5186220).

Almost surely, 2^20730023 is an apocalyptic number.

20730023 is a deficient number, since it is larger than the sum of its proper divisors (14857).

20730023 is a wasteful number, since it uses less digits than its factorization.

20730023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14856.

The product of its (nonzero) digits is 252, while the sum is 17.

The square root of 20730023 is about 4553.0235009277. The cubic root of 20730023 is about 274.7050192370.

Adding to 20730023 its reverse (32003702), we get a palindrome (52733725).

The spelling of 20730023 in words is "twenty million, seven hundred thirty thousand, twenty-three".