20355169 has 8 divisors (see below), whose sum is σ = 20809152. Its totient is φ = 19906320.

The previous prime is 20355157. The next prime is 20355191. The reversal of 20355169 is 96155302.

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 20355169 - 2¹¹ = 20353121 is a prime.

It is a super-2 number, since 2×20355169² = 828665810037122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20355169.

It is not an unprimeable number, because it can be changed into a prime (20355109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7359 + ... + 9739.

It is an arithmetic number, because the mean of its divisors is an integer number (2601144).

Almost surely, 2^20355169 is an apocalyptic number.

It is an amenable number.

20355169 is a deficient number, since it is larger than the sum of its proper divisors (453983).

20355169 is a wasteful number, since it uses less digits than its factorization.

20355169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 20355169 is about 4511.6703115365. The cubic root of 20355169 is about 273.0391379884.

The spelling of 20355169 in words is "twenty million, three hundred fifty-five thousand, one hundred sixty-nine".