20545723 has 8 divisors (see below), whose sum is σ = 22636656. Its totient is φ = 18492000.

The previous prime is 20545711. The next prime is 20545769. The reversal of 20545723 is 32754502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20545723 - 2⁵ = 20545691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20545691 and 20545700.

It is not an unprimeable number, because it can be changed into a prime (20545423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8136 + ... + 10357.

It is an arithmetic number, because the mean of its divisors is an integer number (2829582).

Almost surely, 2^20545723 is an apocalyptic number.

20545723 is a deficient number, since it is larger than the sum of its proper divisors (2090933).

20545723 is a wasteful number, since it uses less digits than its factorization.

20545723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18605.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20545723 is about 4532.7390174154. The cubic root of 20545723 is about 273.8885075722. Note that the first 3 decimals are identical.

It can be divided in two parts, 2054 and 5723, that added together give a palindrome (7777).

The spelling of 20545723 in words is "twenty million, five hundred forty-five thousand, seven hundred twenty-three".