20440444025 has 6 divisors (see below), whose sum is σ = 25346150622. Its totient is φ = 16352355200.

The previous prime is 20440444007. The next prime is 20440444033. The reversal of 20440444025 is 52044404402.

It can be written as a sum of positive squares in 3 ways, for example, as 10601536 + 20429842489 = 3256^2 + 142933^2 .

It is not a de Polignac number, because 20440444025 - 2¹⁴ = 20440427641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 408808856 + ... + 408808905.

It is an arithmetic number, because the mean of its divisors is an integer number (4224358437).

Almost surely, 2^20440444025 is an apocalyptic number.

20440444025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20440444025 is a deficient number, since it is larger than the sum of its proper divisors (4905706597).

20440444025 is an equidigital number, since it uses as much as digits as its factorization.

20440444025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817617771 (or 817617766 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 29.

Adding to 20440444025 its reverse (52044404402), we get a palindrome (72484848427).

The spelling of 20440444025 in words is "twenty billion, four hundred forty million, four hundred forty-four thousand, twenty-five".