20523166 has 8 divisors (see below), whose sum is σ = 30825144. Its totient is φ = 10248120.

The previous prime is 20523157. The next prime is 20523187. The reversal of 20523166 is 66132502.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20523166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4705 + ... + 7948.

It is an arithmetic number, because the mean of its divisors is an integer number (3853143).

Almost surely, 2^20523166 is an apocalyptic number.

20523166 is a deficient number, since it is larger than the sum of its proper divisors (10301978).

20523166 is a wasteful number, since it uses less digits than its factorization.

20523166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13466.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20523166 is about 4530.2501034711. The cubic root of 20523166 is about 273.7882374671.

Adding to 20523166 its reverse (66132502), we get a palindrome (86655668).

The spelling of 20523166 in words is "twenty million, five hundred twenty-three thousand, one hundred sixty-six".