20440727 has 4 divisors (see below), whose sum is σ = 20787240. Its totient is φ = 20094216.

The previous prime is 20440711. The next prime is 20440733. The reversal of 20440727 is 72704402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20440727 - 2⁴ = 20440711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20440696 and 20440705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440747) 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, 173168 + ... + 173285.

It is an arithmetic number, because the mean of its divisors is an integer number (5196810).

Almost surely, 2^20440727 is an apocalyptic number.

20440727 is a deficient number, since it is larger than the sum of its proper divisors (346513).

20440727 is an equidigital number, since it uses as much as digits as its factorization.

20440727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346512.

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 20440727 is about 4521.1422229344. The cubic root of 20440727 is about 273.4211544428.

The spelling of 20440727 in words is "twenty million, four hundred forty thousand, seven hundred twenty-seven".