20836169 has 4 divisors (see below), whose sum is σ = 22061844. Its totient is φ = 19610496.

The previous prime is 20836121. The next prime is 20836187. The reversal of 20836169 is 96163802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18386944 + 2449225 = 4288^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 20836169 - 2²⁴ = 4058953 is a prime.

It is a super-2 number, since 2×20836169² = 868291877193122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20836969) 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, 612812 + ... + 612845.

It is an arithmetic number, because the mean of its divisors is an integer number (5515461).

Almost surely, 2^20836169 is an apocalyptic number.

It is an amenable number.

20836169 is a deficient number, since it is larger than the sum of its proper divisors (1225675).

20836169 is a wasteful number, since it uses less digits than its factorization.

20836169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225674.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20836169 is about 4564.6652670267. The cubic root of 20836169 is about 275.1730877282.

The spelling of 20836169 in words is "twenty million, eight hundred thirty-six thousand, one hundred sixty-nine".