20634166 has 8 divisors (see below), whose sum is σ = 35372880. Its totient is φ = 8843208.

The previous prime is 20634161. The next prime is 20634217. The reversal of 20634166 is 66143602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 736921 + ... + 736948.

It is an arithmetic number, because the mean of its divisors is an integer number (4421610).

Almost surely, 2^20634166 is an apocalyptic number.

20634166 is a deficient number, since it is larger than the sum of its proper divisors (14738714).

20634166 is a wasteful number, since it uses less digits than its factorization.

20634166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473878.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20634166 is about 4542.4845624394. The cubic root of 20634166 is about 274.2809468469.

Adding to 20634166 its reverse (66143602), we get a palindrome (86777768).

The spelling of 20634166 in words is "twenty million, six hundred thirty-four thousand, one hundred sixty-six".