20675887 has 4 divisors (see below), whose sum is σ = 20733840. Its totient is φ = 20617936.

The previous prime is 20675813. The next prime is 20675917. The reversal of 20675887 is 78857602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20675887 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 (20672887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28438 + ... + 29155.

It is an arithmetic number, because the mean of its divisors is an integer number (5183460).

Almost surely, 2^20675887 is an apocalyptic number.

20675887 is a deficient number, since it is larger than the sum of its proper divisors (57953).

20675887 is an equidigital number, since it uses as much as digits as its factorization.

20675887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57952.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 20675887 is about 4547.0745540402. The cubic root of 20675887 is about 274.4656820656.

The spelling of 20675887 in words is "twenty million, six hundred seventy-five thousand, eight hundred eighty-seven".