20849965 has 8 divisors (see below), whose sum is σ = 25139808. Its totient is φ = 16600080.

The previous prime is 20849963. The next prime is 20849977. The reversal of 20849965 is 56994802.

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

It is not a de Polignac number, because 20849965 - 2¹ = 20849963 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 (20849963) by changing a digit.

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, 8827 + ... + 10936.

It is an arithmetic number, because the mean of its divisors is an integer number (3142476).

Almost surely, 2^20849965 is an apocalyptic number.

It is an amenable number.

20849965 is a deficient number, since it is larger than the sum of its proper divisors (4289843).

20849965 is a wasteful number, since it uses less digits than its factorization.

20849965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19979.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 20849965 is about 4566.1761902055. The cubic root of 20849965 is about 275.2338066695.

The spelling of 20849965 in words is "twenty million, eight hundred forty-nine thousand, nine hundred sixty-five".