20395887 has 16 divisors (see below), whose sum is σ = 27888000. Its totient is φ = 13254624.

The previous prime is 20395883. The next prime is 20395891. The reversal of 20395887 is 78859302.

It is an interprime number because it is at equal distance from previous prime (20395883) and next prime (20395891).

It is not a de Polignac number, because 20395887 - 2² = 20395883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20395883) 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, 24189 + ... + 25017.

It is an arithmetic number, because the mean of its divisors is an integer number (1743000).

Almost surely, 2^20395887 is an apocalyptic number.

20395887 is a deficient number, since it is larger than the sum of its proper divisors (7492113).

20395887 is a wasteful number, since it uses less digits than its factorization.

20395887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20395887 is about 4516.1805765492. The cubic root of 20395887 is about 273.2210770774.

The spelling of 20395887 in words is "twenty million, three hundred ninety-five thousand, eight hundred eighty-seven".