20864166 has 32 divisors (see below), whose sum is σ = 45446400. Its totient is φ = 6360480.

The previous prime is 20864161. The next prime is 20864171. The reversal of 20864166 is 66146802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20864161) and next prime (20864171).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (1420200).

Almost surely, 2^20864166 is an apocalyptic number.

20864166 is an abundant number, since it is smaller than the sum of its proper divisors (24582234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20864166 is a wasteful number, since it uses less digits than its factorization.

20864166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6364.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20864166 is about 4567.7309465423. The cubic root of 20864166 is about 275.2962801274.

The spelling of 20864166 in words is "twenty million, eight hundred sixty-four thousand, one hundred sixty-six".