20657163 has 8 divisors (see below), whose sum is σ = 27565776. Its totient is φ = 13760000.

The previous prime is 20657149. The next prime is 20657171. The reversal of 20657163 is 36175602.

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

It is a cyclic number.

It is not a de Polignac number, because 20657163 - 2²⁰ = 19608587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20657163.

It is not an unprimeable number, because it can be changed into a prime (20657173) 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, 3163 + ... + 7163.

It is an arithmetic number, because the mean of its divisors is an integer number (3445722).

Almost surely, 2^20657163 is an apocalyptic number.

20657163 is a deficient number, since it is larger than the sum of its proper divisors (6908613).

20657163 is a wasteful number, since it uses less digits than its factorization.

20657163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5725.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20657163 is about 4545.0151814928. The cubic root of 20657163 is about 274.3828053708.

The spelling of 20657163 in words is "twenty million, six hundred fifty-seven thousand, one hundred sixty-three".