20525355513 has 24 divisors (see below), whose sum is σ = 31974662720. Its totient is φ = 12612659040.

The previous prime is 20525355497. The next prime is 20525355517. The reversal of 20525355513 is 31555352502.

20525355513 is a `hidden beast` number, since 2 + 0 + 52 + 53 + 5 + 551 + 3 = 666.

It is not a de Polignac number, because 20525355513 - 2⁴ = 20525355497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20525355517) by changing a digit.

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, 46093 + ... + 207786.

Almost surely, 2^20525355513 is an apocalyptic number.

It is an amenable number.

20525355513 is a deficient number, since it is larger than the sum of its proper divisors (11449307207).

20525355513 is a wasteful number, since it uses less digits than its factorization.

20525355513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254589 (or 254586 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 36.

The spelling of 20525355513 in words is "twenty billion, five hundred twenty-five million, three hundred fifty-five thousand, five hundred thirteen".