20641875 has 40 divisors (see below), whose sum is σ = 35051280. Its totient is φ = 10800000.

The previous prime is 20641871. The next prime is 20641909. The reversal of 20641875 is 57814602.

It is not a de Polignac number, because 20641875 - 2² = 20641871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20641871) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 189321 + ... + 189429.

It is an arithmetic number, because the mean of its divisors is an integer number (876282).

Almost surely, 2^20641875 is an apocalyptic number.

20641875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20641875 is a deficient number, since it is larger than the sum of its proper divisors (14409405).

20641875 is a wasteful number, since it uses less digits than its factorization.

20641875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20641875 is about 4543.3330276351. Note that the first 3 decimals coincide. The cubic root of 20641875 is about 274.3151000495.

The spelling of 20641875 in words is "twenty million, six hundred forty-one thousand, eight hundred seventy-five".