20525002505 has 16 divisors (see below), whose sum is σ = 29056594944. Its totient is φ = 13620277440.

The previous prime is 20525002481. The next prime is 20525002549. The reversal of 20525002505 is 50520052502.

It is not a de Polignac number, because 20525002505 - 2⁸ = 20525002249 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 15 ways as a sum of consecutive naturals, for example, 9457442 + ... + 9459611.

It is an arithmetic number, because the mean of its divisors is an integer number (1816037184).

Almost surely, 2^20525002505 is an apocalyptic number.

It is an amenable number.

20525002505 is a deficient number, since it is larger than the sum of its proper divisors (8531592439).

20525002505 is a wasteful number, since it uses less digits than its factorization.

20525002505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18917096.

The product of its (nonzero) digits is 5000, while the sum is 26.

The spelling of 20525002505 in words is "twenty billion, five hundred twenty-five million, two thousand, five hundred five".