20138169 has 4 divisors (see below), whose sum is σ = 26850896. Its totient is φ = 13425444.

The previous prime is 20138159. The next prime is 20138171. The reversal of 20138169 is 96183102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20138169 - 2⁸ = 20137913 is a prime.

It is a super-2 number, since 2×20138169² = 811091701345122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20138159) 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, 3356359 + ... + 3356364.

It is an arithmetic number, because the mean of its divisors is an integer number (6712724).

Almost surely, 2^20138169 is an apocalyptic number.

It is an amenable number.

20138169 is a deficient number, since it is larger than the sum of its proper divisors (6712727).

20138169 is an equidigital number, since it uses as much as digits as its factorization.

20138169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6712726.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 20138169 is about 4487.5571305556. The cubic root of 20138169 is about 272.0654083255.

The spelling of 20138169 in words is "twenty million, one hundred thirty-eight thousand, one hundred sixty-nine".