20525723 has 4 divisors (see below), whose sum is σ = 20535168. Its totient is φ = 20516280.

The previous prime is 20525677. The next prime is 20525753. The reversal of 20525723 is 32752502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32752502 = 2 ⋅16376251.

It is a cyclic number.

It is not a de Polignac number, because 20525723 - 2¹⁴ = 20509339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20525692 and 20525701.

It is not an unprimeable number, because it can be changed into a prime (20525753) 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 3 ways as a sum of consecutive naturals, for example, 365 + ... + 6417.

It is an arithmetic number, because the mean of its divisors is an integer number (5133792).

Almost surely, 2^20525723 is an apocalyptic number.

20525723 is a deficient number, since it is larger than the sum of its proper divisors (9445).

20525723 is an equidigital number, since it uses as much as digits as its factorization.

20525723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9444.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20525723 is about 4530.5323086807. The cubic root of 20525723 is about 273.7996075038.

The spelling of 20525723 in words is "twenty million, five hundred twenty-five thousand, seven hundred twenty-three".