20504941 has 4 divisors (see below), whose sum is σ = 21711132. Its totient is φ = 19298752.

The previous prime is 20504923. The next prime is 20504959. The reversal of 20504941 is 14940502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14940502 = 2 ⋅7470251.

It is an interprime number because it is at equal distance from previous prime (20504923) and next prime (20504959).

It can be written as a sum of positive squares in 2 ways, for example, as 14600041 + 5904900 = 3821^2 + 2430^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504941 - 2⁵ = 20504909 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 603070 + ... + 603103.

It is an arithmetic number, because the mean of its divisors is an integer number (5427783).

Almost surely, 2^20504941 is an apocalyptic number.

It is an amenable number.

20504941 is a deficient number, since it is larger than the sum of its proper divisors (1206191).

20504941 is a wasteful number, since it uses less digits than its factorization.

20504941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206190.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20504941 is about 4528.2381783647. The cubic root of 20504941 is about 273.7071702418.

The spelling of 20504941 in words is "twenty million, five hundred four thousand, nine hundred forty-one".