20078169 has 4 divisors (see below), whose sum is σ = 26770896. Its totient is φ = 13385444.

The previous prime is 20078167. The next prime is 20078183. The reversal of 20078169 is 96187002.

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 a cyclic number.

It is not a de Polignac number, because 20078169 - 2¹ = 20078167 is a prime.

It is a super-4 number, since 4×20078169⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20078167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3346359 + ... + 3346364.

It is an arithmetic number, because the mean of its divisors is an integer number (6692724).

Almost surely, 2^20078169 is an apocalyptic number.

It is an amenable number.

20078169 is a deficient number, since it is larger than the sum of its proper divisors (6692727).

20078169 is an equidigital number, since it uses as much as digits as its factorization.

20078169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6692726.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20078169 is about 4480.8669920005. The cubic root of 20078169 is about 271.7949407818.

The spelling of 20078169 in words is "twenty million, seventy-eight thousand, one hundred sixty-nine".