20138207 has 4 divisors (see below), whose sum is σ = 20380920. Its totient is φ = 19895496.

The previous prime is 20138197. The next prime is 20138219. The reversal of 20138207 is 70283102.

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 20138207 - 2⁴ = 20138191 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138407) 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, 121232 + ... + 121397.

It is an arithmetic number, because the mean of its divisors is an integer number (5095230).

Almost surely, 2^20138207 is an apocalyptic number.

20138207 is a deficient number, since it is larger than the sum of its proper divisors (242713).

20138207 is an equidigital number, since it uses as much as digits as its factorization.

20138207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242712.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20138207 is about 4487.5613644829. The cubic root of 20138207 is about 272.0655794513.

The spelling of 20138207 in words is "twenty million, one hundred thirty-eight thousand, two hundred seven".