20164870 has 16 divisors (see below), whose sum is σ = 39596688. Its totient is φ = 7332640.

The previous prime is 20164853. The next prime is 20164877. The reversal of 20164870 is 7846102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91549 + ... + 91768.

It is an arithmetic number, because the mean of its divisors is an integer number (2474793).

Almost surely, 2^20164870 is an apocalyptic number.

20164870 is a deficient number, since it is larger than the sum of its proper divisors (19431818).

20164870 is a wasteful number, since it uses less digits than its factorization.

20164870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183335.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20164870 is about 4490.5311489845. The cubic root of 20164870 is about 272.1855981704.

It can be divided in two parts, 2016 and 4870, that added together give a palindrome (6886).

The spelling of 20164870 in words is "twenty million, one hundred sixty-four thousand, eight hundred seventy".