20849567 has 4 divisors (see below), whose sum is σ = 21008856. Its totient is φ = 20690280.

The previous prime is 20849561. The next prime is 20849573. The reversal of 20849567 is 76594802.

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

It is an interprime number because it is at equal distance from previous prime (20849561) and next prime (20849573).

It is a cyclic number.

It is not a de Polignac number, because 20849567 - 2⁴ = 20849551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849561) 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, 79448 + ... + 79709.

It is an arithmetic number, because the mean of its divisors is an integer number (5252214).

Almost surely, 2^20849567 is an apocalyptic number.

20849567 is a deficient number, since it is larger than the sum of its proper divisors (159289).

20849567 is a wasteful number, since it uses less digits than its factorization.

20849567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159288.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20849567 is about 4566.1326086744. The cubic root of 20849567 is about 275.2320553675.

The spelling of 20849567 in words is "twenty million, eight hundred forty-nine thousand, five hundred sixty-seven".