20540263 has 4 divisors (see below), whose sum is σ = 20564928. Its totient is φ = 20515600.

The previous prime is 20540251. The next prime is 20540279. The reversal of 20540263 is 36204502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36204502 = 2 ⋅18102251.

It is a cyclic number.

It is not a de Polignac number, because 20540263 - 2⁵ = 20540231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540243) 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, 11038 + ... + 12763.

It is an arithmetic number, because the mean of its divisors is an integer number (5141232).

Almost surely, 2^20540263 is an apocalyptic number.

20540263 is a deficient number, since it is larger than the sum of its proper divisors (24665).

20540263 is an equidigital number, since it uses as much as digits as its factorization.

20540263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24664.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20540263 is about 4532.1366925546. The cubic root of 20540263 is about 273.8642435807.

Adding to 20540263 its reverse (36204502), we get a palindrome (56744765).

The spelling of 20540263 in words is "twenty million, five hundred forty thousand, two hundred sixty-three".