20185169 has 8 divisors (see below), whose sum is σ = 20448288. Its totient is φ = 19924000.

The previous prime is 20185159. The next prime is 20185177. The reversal of 20185169 is 96158102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20185169 - 2¹⁶ = 20119633 is a prime.

It is a super-2 number, since 2×20185169² = 814882095117122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20185129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34094 + ... + 34680.

It is an arithmetic number, because the mean of its divisors is an integer number (2556036).

Almost surely, 2^20185169 is an apocalyptic number.

It is an amenable number.

20185169 is a deficient number, since it is larger than the sum of its proper divisors (263119).

20185169 is a wasteful number, since it uses less digits than its factorization.

20185169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 20185169 is about 4492.7907807954. The cubic root of 20185169 is about 272.2768995697.

The spelling of 20185169 in words is "twenty million, one hundred eighty-five thousand, one hundred sixty-nine".