20525135 has 16 divisors (see below), whose sum is σ = 25353216. Its totient is φ = 15943968.

The previous prime is 20525129. The next prime is 20525159. The reversal of 20525135 is 53152502.

It is a cyclic number.

It is not a de Polignac number, because 20525135 - 2¹⁰ = 20524111 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 20525135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38984 + ... + 39506.

It is an arithmetic number, because the mean of its divisors is an integer number (1584576).

Almost surely, 2^20525135 is an apocalyptic number.

20525135 is a deficient number, since it is larger than the sum of its proper divisors (4828081).

20525135 is a wasteful number, since it uses less digits than its factorization.

20525135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 20525135 is about 4530.4674151791. The cubic root of 20525135 is about 273.7969929681.

Adding to 20525135 its reverse (53152502), we get a palindrome (73677637).

The spelling of 20525135 in words is "twenty million, five hundred twenty-five thousand, one hundred thirty-five".