20938166 has 4 divisors (see below), whose sum is σ = 31407252. Its totient is φ = 10469082.

The previous prime is 20938117. The next prime is 20938193. The reversal of 20938166 is 66183902.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5234540 + ... + 5234543.

It is an arithmetic number, because the mean of its divisors is an integer number (7851813).

Almost surely, 2^20938166 is an apocalyptic number.

20938166 is a deficient number, since it is larger than the sum of its proper divisors (10469086).

20938166 is a wasteful number, since it uses less digits than its factorization.

20938166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10469085.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20938166 is about 4575.8240787862. The cubic root of 20938166 is about 275.6213652097.

The spelling of 20938166 in words is "twenty million, nine hundred thirty-eight thousand, one hundred sixty-six".