20395659425 has 12 divisors (see below), whose sum is σ = 25337382396. Its totient is φ = 16286356800.

The previous prime is 20395659397. The next prime is 20395659451. The reversal of 20395659425 is 52495659302.

It can be written as a sum of positive squares in 6 ways, for example, as 650913169 + 19744746256 = 25513^2 + 140516^2 .

It is not a de Polignac number, because 20395659425 - 2²⁸ = 20127223969 is a prime.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 740474 + ... + 767523.

It is an arithmetic number, because the mean of its divisors is an integer number (2111448533).

Almost surely, 2^20395659425 is an apocalyptic number.

20395659425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20395659425 is a deficient number, since it is larger than the sum of its proper divisors (4941722971).

20395659425 is a wasteful number, since it uses less digits than its factorization.

20395659425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508548 (or 1508543 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 50.

The spelling of 20395659425 in words is "twenty billion, three hundred ninety-five million, six hundred fifty-nine thousand, four hundred twenty-five".