20641874 has 12 divisors (see below), whose sum is σ = 34033902. Its totient is φ = 9382560.

The previous prime is 20641871. The next prime is 20641909. The reversal of 20641874 is 47814602.

It can be written as a sum of positive squares in only one way, i.e., 20638849 + 3025 = 4543^2 + 55^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20641874.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641871) 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 5 ways as a sum of consecutive naturals, for example, 42407 + ... + 42890.

Almost surely, 2^20641874 is an apocalyptic number.

20641874 is a deficient number, since it is larger than the sum of its proper divisors (13392028).

20641874 is a wasteful number, since it uses less digits than its factorization.

20641874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85321 (or 85310 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20641874 is about 4543.3329175837. The cubic root of 20641874 is about 274.3150956197.

The spelling of 20641874 in words is "twenty million, six hundred forty-one thousand, eight hundred seventy-four".