20134687 has 4 divisors (see below), whose sum is σ = 20169576. Its totient is φ = 20099800.

The previous prime is 20134669. The next prime is 20134703. The reversal of 20134687 is 78643102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20134687 - 2¹¹ = 20132639 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20134627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16564 + ... + 17737.

It is an arithmetic number, because the mean of its divisors is an integer number (5042394).

Almost surely, 2^20134687 is an apocalyptic number.

20134687 is a deficient number, since it is larger than the sum of its proper divisors (34889).

20134687 is an equidigital number, since it uses as much as digits as its factorization.

20134687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34888.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20134687 is about 4487.1691521493. The cubic root of 20134687 is about 272.0497268874.

Adding to 20134687 its reverse (78643102), we get a palindrome (98777789).

The spelling of 20134687 in words is "twenty million, one hundred thirty-four thousand, six hundred eighty-seven".