20444403 has 16 divisors (see below), whose sum is σ = 31216640. Its totient is φ = 11658816.

The previous prime is 20444381. The next prime is 20444429. The reversal of 20444403 is 30444402.

It is not a de Polignac number, because 20444403 - 2⁵ = 20444371 is a prime.

It is a super-2 number, since 2×20444403² = 835947228052818, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20444403.

It is not an unprimeable number, because it can be changed into a prime (20442403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19158 + ... + 20196.

It is an arithmetic number, because the mean of its divisors is an integer number (1951040).

Almost surely, 2^20444403 is an apocalyptic number.

20444403 is a deficient number, since it is larger than the sum of its proper divisors (10772237).

20444403 is a wasteful number, since it uses less digits than its factorization.

20444403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 20444403 is about 4521.5487390937. The cubic root of 20444403 is about 273.4375438781.

Adding to 20444403 its reverse (30444402), we get a palindrome (50888805).

Subtracting 20444403 from its reverse (30444402), we obtain a palindrome (9999999).

The spelling of 20444403 in words is "twenty million, four hundred forty-four thousand, four hundred three".