20866670 has 16 divisors (see below), whose sum is σ = 40974768. Its totient is φ = 7587840.

The previous prime is 20866669. The next prime is 20866679. The reversal of 20866670 is 7666802.

It is a self number, because there is not a number n which added to its sum of digits gives 20866670.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94739 + ... + 94958.

It is an arithmetic number, because the mean of its divisors is an integer number (2560923).

Almost surely, 2^20866670 is an apocalyptic number.

20866670 is a deficient number, since it is larger than the sum of its proper divisors (20108098).

20866670 is a wasteful number, since it uses less digits than its factorization.

20866670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189715.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20866670 is about 4568.0050350235. The cubic root of 20866670 is about 275.3072928579.

The spelling of 20866670 in words is "twenty million, eight hundred sixty-six thousand, six hundred seventy".