20857701 has 8 divisors (see below), whose sum is σ = 27868000. Its totient is φ = 13876272.

The previous prime is 20857679. The next prime is 20857717. The reversal of 20857701 is 10775802.

It is a happy number.

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

It is not a de Polignac number, because 20857701 - 2¹³ = 20849509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857721) 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, 5470 + ... + 8463.

It is an arithmetic number, because the mean of its divisors is an integer number (3483500).

Almost surely, 2^20857701 is an apocalyptic number.

It is an amenable number.

20857701 is a deficient number, since it is larger than the sum of its proper divisors (7010299).

20857701 is a wasteful number, since it uses less digits than its factorization.

20857701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14435.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 20857701 is about 4567.0232099257. The cubic root of 20857701 is about 275.2678426250.

The spelling of 20857701 in words is "twenty million, eight hundred fifty-seven thousand, seven hundred one".