20440204421 has 24 divisors (see below), whose sum is σ = 25697760984. Its totient is φ = 16114775040.

The previous prime is 20440204391. The next prime is 20440204441. The reversal of 20440204421 is 12440204402.

It can be written as a sum of positive squares in 4 ways, for example, as 4567732225 + 15872472196 = 67585^2 + 125986^2 .

It is not a de Polignac number, because 20440204421 - 2¹⁴ = 20440188037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440204441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121901 + ... + 236093.

It is an arithmetic number, because the mean of its divisors is an integer number (1070740041).

Almost surely, 2^20440204421 is an apocalyptic number.

It is an amenable number.

20440204421 is a deficient number, since it is larger than the sum of its proper divisors (5257556563).

20440204421 is a wasteful number, since it uses less digits than its factorization.

20440204421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114501 (or 114494 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 20440204421 its reverse (12440204402), we get a palindrome (32880408823).

It can be divided in two parts, 204402044 and 21, that multiplied together give a palindrome (4292442924).

The spelling of 20440204421 in words is "twenty billion, four hundred forty million, two hundred four thousand, four hundred twenty-one".