20840695 has 8 divisors (see below), whose sum is σ = 25092144. Its totient is φ = 16617024.

The previous prime is 20840683. The next prime is 20840707. The reversal of 20840695 is 59604802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20840683) and next prime (20840707).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20840695 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20840695.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5254 + ... + 8323.

It is an arithmetic number, because the mean of its divisors is an integer number (3136518).

Almost surely, 2^20840695 is an apocalyptic number.

20840695 is a deficient number, since it is larger than the sum of its proper divisors (4251449).

20840695 is a wasteful number, since it uses less digits than its factorization.

20840695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13889.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 20840695 is about 4565.1610048278. The cubic root of 20840695 is about 275.1930105082.

The spelling of 20840695 in words is "twenty million, eight hundred forty thousand, six hundred ninety-five".