20853717 has 8 divisors (see below), whose sum is σ = 27879840. Its totient is φ = 13865040.

The previous prime is 20853673. The next prime is 20853719. The reversal of 20853717 is 71735802.

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

It is not a de Polignac number, because 20853717 - 2²⁰ = 19805141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8034 + ... + 10307.

It is an arithmetic number, because the mean of its divisors is an integer number (3484980).

Almost surely, 2^20853717 is an apocalyptic number.

It is an amenable number.

20853717 is a deficient number, since it is larger than the sum of its proper divisors (7026123).

20853717 is a wasteful number, since it uses less digits than its factorization.

20853717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18723.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 20853717 is about 4566.5870187701. The cubic root of 20853717 is about 275.2503153351.

The spelling of 20853717 in words is "twenty million, eight hundred fifty-three thousand, seven hundred seventeen".