20044405 has 4 divisors (see below), whose sum is σ = 24053292. Its totient is φ = 16035520.

The previous prime is 20044397. The next prime is 20044447. The reversal of 20044405 is 50444002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12327121 + 7717284 = 3511^2 + 2778^2 .

It is not a de Polignac number, because 20044405 - 2³ = 20044397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004436 + ... + 2004445.

It is an arithmetic number, because the mean of its divisors is an integer number (6013323).

Almost surely, 2^20044405 is an apocalyptic number.

It is an amenable number.

20044405 is a deficient number, since it is larger than the sum of its proper divisors (4008887).

20044405 is an equidigital number, since it uses as much as digits as its factorization.

20044405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008886.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20044405 is about 4477.0978323016. The cubic root of 20044405 is about 271.6425026914.

Adding to 20044405 its reverse (50444002), we get a palindrome (70488407).

It can be divided in two parts, 20044 and 405, that added together give a square (20449 = 143²).

The spelling of 20044405 in words is "twenty million, forty-four thousand, four hundred five".