20164138 has 8 divisors (see below), whose sum is σ = 30439332. Its totient is φ = 10017696.

The previous prime is 20164127. The next prime is 20164139. The reversal of 20164138 is 83146102.

It can be written as a sum of positive squares in 2 ways, for example, as 19158129 + 1006009 = 4377^2 + 1003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20164138² = 813184922566088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20164139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31795 + ... + 32422.

Almost surely, 2^20164138 is an apocalyptic number.

20164138 is a deficient number, since it is larger than the sum of its proper divisors (10275194).

20164138 is a wasteful number, since it uses less digits than its factorization.

20164138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64376.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20164138 is about 4490.4496434099. The cubic root of 20164138 is about 272.1823046163.

It can be divided in two parts, 20164 and 138, that added together give a palindrome (20302).

The spelling of 20164138 in words is "twenty million, one hundred sixty-four thousand, one hundred thirty-eight".