20440143525 has 24 divisors (see below), whose sum is σ = 34580291680. Its totient is φ = 10647887040.

The previous prime is 20440143481. The next prime is 20440143541. The reversal of 20440143525 is 52534104402.

It is not a de Polignac number, because 20440143525 - 2⁶ = 20440143461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20440143492 and 20440143501.

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 23 ways as a sum of consecutive naturals, for example, 3165790 + ... + 3172239.

Almost surely, 2^20440143525 is an apocalyptic number.

20440143525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20440143525 is a deficient number, since it is larger than the sum of its proper divisors (14140148155).

20440143525 is a wasteful number, since it uses less digits than its factorization.

20440143525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6338085 (or 6338080 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 20440143525 its reverse (52534104402), we get a palindrome (72974247927).

The spelling of 20440143525 in words is "twenty billion, four hundred forty million, one hundred forty-three thousand, five hundred twenty-five".