20507647025 has 12 divisors (see below), whose sum is σ = 25435593372. Its totient is φ = 16402175040.

The previous prime is 20507647019. The next prime is 20507647057. The reversal of 20507647025 is 52074670502.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 764024881 + 19743622144 = 27641^2 + 140512^2 .

It is not a de Polignac number, because 20507647025 - 2⁸ = 20507646769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20507647025.

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 11 ways as a sum of consecutive naturals, for example, 9887 + ... + 202763.

It is an arithmetic number, because the mean of its divisors is an integer number (2119632781).

Almost surely, 2^20507647025 is an apocalyptic number.

20507647025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20507647025 is a deficient number, since it is larger than the sum of its proper divisors (4927946347).

20507647025 is a wasteful number, since it uses less digits than its factorization.

20507647025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197140 (or 197135 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 20507647025 in words is "twenty billion, five hundred seven million, six hundred forty-seven thousand, twenty-five".