20440805 has 16 divisors (see below), whose sum is σ = 30582144. Its totient is φ = 12742080.

The previous prime is 20440801. The next prime is 20440877. The reversal of 20440805 is 50804402.

It is not a de Polignac number, because 20440805 - 2² = 20440801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26162 + ... + 26931.

It is an arithmetic number, because the mean of its divisors is an integer number (1911384).

Almost surely, 2^20440805 is an apocalyptic number.

It is an amenable number.

20440805 is a deficient number, since it is larger than the sum of its proper divisors (10141339).

20440805 is a wasteful number, since it uses less digits than its factorization.

20440805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53116.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20440805 is about 4521.1508490649. The cubic root of 20440805 is about 273.4215022260.

The spelling of 20440805 in words is "twenty million, four hundred forty thousand, eight hundred five".