20838166 has 4 divisors (see below), whose sum is σ = 31257252. Its totient is φ = 10419082.

The previous prime is 20838163. The next prime is 20838173. The reversal of 20838166 is 66183802.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20838163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5209540 + ... + 5209543.

It is an arithmetic number, because the mean of its divisors is an integer number (7814313).

Almost surely, 2^20838166 is an apocalyptic number.

20838166 is a deficient number, since it is larger than the sum of its proper divisors (10419086).

20838166 is a wasteful number, since it uses less digits than its factorization.

20838166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10419085.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20838166 is about 4564.8840072887. The cubic root of 20838166 is about 275.1818785813.

The spelling of 20838166 in words is "twenty million, eight hundred thirty-eight thousand, one hundred sixty-six".