20887163 has 16 divisors (see below), whose sum is σ = 24161760. Its totient is φ = 17875200.

The previous prime is 20887159. The next prime is 20887177. The reversal of 20887163 is 36178802.

It is a cyclic number.

It is not a de Polignac number, because 20887163 - 2² = 20887159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20887133) 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 15 ways as a sum of consecutive naturals, for example, 12281 + ... + 13877.

It is an arithmetic number, because the mean of its divisors is an integer number (1510110).

Almost surely, 2^20887163 is an apocalyptic number.

20887163 is a deficient number, since it is larger than the sum of its proper divisors (3274597).

20887163 is a wasteful number, since it uses less digits than its factorization.

20887163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20887163 is about 4570.2475862911. The cubic root of 20887163 is about 275.3973891121.

The spelling of 20887163 in words is "twenty million, eight hundred eighty-seven thousand, one hundred sixty-three".