20866795 has 4 divisors (see below), whose sum is σ = 25040160. Its totient is φ = 16693432.

The previous prime is 20866793. The next prime is 20866801. The reversal of 20866795 is 59766802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59766802 = 2 ⋅29883401.

It is a cyclic number.

It is not a de Polignac number, because 20866795 - 2¹ = 20866793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20866793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2086675 + ... + 2086684.

It is an arithmetic number, because the mean of its divisors is an integer number (6260040).

Almost surely, 2^20866795 is an apocalyptic number.

20866795 is a deficient number, since it is larger than the sum of its proper divisors (4173365).

20866795 is an equidigital number, since it uses as much as digits as its factorization.

20866795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173364.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 20866795 is about 4568.0187171245. The cubic root of 20866795 is about 275.3078425917.

The spelling of 20866795 in words is "twenty million, eight hundred sixty-six thousand, seven hundred ninety-five".