20636925 has 12 divisors (see below), whose sum is σ = 34119840. Its totient is φ = 11006320.

The previous prime is 20636923. The next prime is 20636927. The reversal of 20636925 is 52963602.

It is an interprime number because it is at equal distance from previous prime (20636923) and next prime (20636927).

It is not a de Polignac number, because 20636925 - 2¹ = 20636923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137505 + ... + 137654.

It is an arithmetic number, because the mean of its divisors is an integer number (2843320).

Almost surely, 2^20636925 is an apocalyptic number.

20636925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20636925 is a deficient number, since it is larger than the sum of its proper divisors (13482915).

20636925 is a wasteful number, since it uses less digits than its factorization.

20636925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275172 (or 275167 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 20636925 is about 4542.7882407174. The cubic root of 20636925 is about 274.2931710290.

The spelling of 20636925 in words is "twenty million, six hundred thirty-six thousand, nine hundred twenty-five".