20895169 has 4 divisors (see below), whose sum is σ = 21080196. Its totient is φ = 20710144.

The previous prime is 20895163. The next prime is 20895179. The reversal of 20895169 is 96159802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96159802 = 2 ⋅48079901.

It can be written as a sum of positive squares in 2 ways, for example, as 1181569 + 19713600 = 1087^2 + 4440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20895169 - 2¹³ = 20886977 is a prime.

It is a super-2 number, since 2×20895169² = 873216175077122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20895163) 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, 92344 + ... + 92569.

It is an arithmetic number, because the mean of its divisors is an integer number (5270049).

Almost surely, 2^20895169 is an apocalyptic number.

It is an amenable number.

20895169 is a deficient number, since it is larger than the sum of its proper divisors (185027).

20895169 is a wasteful number, since it uses less digits than its factorization.

20895169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185026.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 20895169 is about 4571.1233849022. The cubic root of 20895169 is about 275.4325710060.

The spelling of 20895169 in words is "twenty million, eight hundred ninety-five thousand, one hundred sixty-nine".