20525686 has 4 divisors (see below), whose sum is σ = 30788532. Its totient is φ = 10262842.

The previous prime is 20525677. The next prime is 20525753. The reversal of 20525686 is 68652502.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5131420 + ... + 5131423.

It is an arithmetic number, because the mean of its divisors is an integer number (7697133).

Almost surely, 2^20525686 is an apocalyptic number.

20525686 is a deficient number, since it is larger than the sum of its proper divisors (10262846).

20525686 is a wasteful number, since it uses less digits than its factorization.

20525686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10262845.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 20525686 is about 4530.5282252735. The cubic root of 20525686 is about 273.7994429852.

The spelling of 20525686 in words is "twenty million, five hundred twenty-five thousand, six hundred eighty-six".