20445442525 has 6 divisors (see below), whose sum is σ = 25352348762. Its totient is φ = 16356354000.

The previous prime is 20445442487. The next prime is 20445442543. The reversal of 20445442525 is 52524454402.

It can be written as a sum of positive squares in 3 ways, for example, as 5595339204 + 14850103321 = 74802^2 + 121861^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20445442525 is a prime.

It is a super-2 number, since 2×20445442525² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 408908826 + ... + 408908875.

Almost surely, 2^20445442525 is an apocalyptic number.

20445442525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20445442525 is a deficient number, since it is larger than the sum of its proper divisors (4906906237).

20445442525 is an equidigital number, since it uses as much as digits as its factorization.

20445442525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817817711 (or 817817706 counting only the distinct ones).

The product of its (nonzero) digits is 256000, while the sum is 37.

Adding to 20445442525 its reverse (52524454402), we get a palindrome (72969896927).

The spelling of 20445442525 in words is "twenty billion, four hundred forty-five million, four hundred forty-two thousand, five hundred twenty-five".