20504925 has 72 divisors (see below), whose sum is σ = 43021056. Its totient is φ = 9141120.

The previous prime is 20504923. The next prime is 20504959. The reversal of 20504925 is 52940502.

It is not a de Polignac number, because 20504925 - 2¹ = 20504923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504921) by changing a digit.

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 in 71 ways as a sum of consecutive naturals, for example, 73887 + ... + 74163.

Almost surely, 2^20504925 is an apocalyptic number.

20504925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20504925 is an abundant number, since it is smaller than the sum of its proper divisors (22516131).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20504925 is a wasteful number, since it uses less digits than its factorization.

20504925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20504925 is about 4528.2364116729. The cubic root of 20504925 is about 273.7070990505.

The spelling of 20504925 in words is "twenty million, five hundred four thousand, nine hundred twenty-five".