20218166 has 24 divisors (see below), whose sum is σ = 32836104. Its totient is φ = 9329760.

The previous prime is 20218141. The next prime is 20218183. The reversal of 20218166 is 66181202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29261 + ... + 29943.

It is an arithmetic number, because the mean of its divisors is an integer number (1368171).

Almost surely, 2^20218166 is an apocalyptic number.

20218166 is a deficient number, since it is larger than the sum of its proper divisors (12617938).

20218166 is a wasteful number, since it uses less digits than its factorization.

20218166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20218166 is about 4496.4614976668. The cubic root of 20218166 is about 272.4251838487.

Adding to 20218166 its reverse (66181202), we get a palindrome (86399368).

The spelling of 20218166 in words is "twenty million, two hundred eighteen thousand, one hundred sixty-six".