20158664 has 16 divisors (see below), whose sum is σ = 37921500. Its totient is φ = 10046272.

The previous prime is 20158661. The next prime is 20158681. The reversal of 20158664 is 46685102.

It can be written as a sum of positive squares in 2 ways, for example, as 18576100 + 1582564 = 4310^2 + 1258^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20158664.

It is not an unprimeable number, because it can be changed into a prime (20158661) 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 3 ways as a sum of consecutive naturals, for example, 1439 + ... + 6510.

Almost surely, 2^20158664 is an apocalyptic number.

It is an amenable number.

20158664 is a deficient number, since it is larger than the sum of its proper divisors (17762836).

20158664 is a wasteful number, since it uses less digits than its factorization.

20158664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272 (or 8268 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20158664 is about 4489.8400862392. The cubic root of 20158664 is about 272.1576724239.

The spelling of 20158664 in words is "twenty million, one hundred fifty-eight thousand, six hundred sixty-four".