20620723 has 4 divisors (see below), whose sum is σ = 20656440. Its totient is φ = 20585008.

The previous prime is 20620709. The next prime is 20620751. The reversal of 20620723 is 32702602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32702602 = 2 ⋅16351301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20620723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20620694 and 20620703.

It is not an unprimeable number, because it can be changed into a prime (20620783) 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, 16978 + ... + 18151.

It is an arithmetic number, because the mean of its divisors is an integer number (5164110).

Almost surely, 2^20620723 is an apocalyptic number.

20620723 is a deficient number, since it is larger than the sum of its proper divisors (35717).

20620723 is an equidigital number, since it uses as much as digits as its factorization.

20620723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35716.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20620723 is about 4541.0046245297. The cubic root of 20620723 is about 274.2213699333.

The spelling of 20620723 in words is "twenty million, six hundred twenty thousand, seven hundred twenty-three".