20865695 has 4 divisors (see below), whose sum is σ = 25038840. Its totient is φ = 16692552.

The previous prime is 20865671. The next prime is 20865701. The reversal of 20865695 is 59656802.

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

It is a cyclic number.

It is not a de Polignac number, because 20865695 - 2¹⁶ = 20800159 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2086565 + ... + 2086574.

It is an arithmetic number, because the mean of its divisors is an integer number (6259710).

Almost surely, 2^20865695 is an apocalyptic number.

20865695 is a deficient number, since it is larger than the sum of its proper divisors (4173145).

20865695 is an equidigital number, since it uses as much as digits as its factorization.

20865695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173144.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 20865695 is about 4567.8983132290. The cubic root of 20865695 is about 275.3030048587.

The spelling of 20865695 in words is "twenty million, eight hundred sixty-five thousand, six hundred ninety-five".