20440013525 has 18 divisors (see below), whose sum is σ = 26189622306. Its totient is φ = 15824508000.

The previous prime is 20440013519. The next prime is 20440013557. The reversal of 20440013525 is 52531004402.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 52171729 + 20387841796 = 7223^2 + 142786^2 .

It is not a de Polignac number, because 20440013525 - 2¹⁶ = 20439947989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20440013494 and 20440013503.

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 17 ways as a sum of consecutive naturals, for example, 401366 + ... + 449415.

It is an arithmetic number, because the mean of its divisors is an integer number (1454979017).

Almost surely, 2^20440013525 is an apocalyptic number.

20440013525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20440013525 is a deficient number, since it is larger than the sum of its proper divisors (5749608781).

20440013525 is an equidigital number, since it uses as much as digits as its factorization.

20440013525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850853 (or 850817 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20440013525 its reverse (52531004402), we get a palindrome (72971017927).

The spelling of 20440013525 in words is "twenty billion, four hundred forty million, thirteen thousand, five hundred twenty-five".