20166157 has 8 divisors (see below), whose sum is σ = 22093632. Its totient is φ = 18254400.

The previous prime is 20166143. The next prime is 20166161. The reversal of 20166157 is 75166102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20166157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166127) 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, 1153 + ... + 6454.

It is an arithmetic number, because the mean of its divisors is an integer number (2761704).

Almost surely, 2^20166157 is an apocalyptic number.

It is an amenable number.

20166157 is a deficient number, since it is larger than the sum of its proper divisors (1927475).

20166157 is a wasteful number, since it uses less digits than its factorization.

20166157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7859.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20166157 is about 4490.6744482316. The cubic root of 20166157 is about 272.1913886931.

Subtracting 20166157 from its reverse (75166102), we obtain a palindrome (54999945).

The spelling of 20166157 in words is "twenty million, one hundred sixty-six thousand, one hundred fifty-seven".