20678169 has 8 divisors (see below), whose sum is σ = 27855520. Its totient is φ = 13643136.

The previous prime is 20678159. The next prime is 20678179. The reversal of 20678169 is 96187602.

It is an interprime number because it is at equal distance from previous prime (20678159) and next prime (20678179).

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

It is not a de Polignac number, because 20678169 - 2¹¹ = 20676121 is a prime.

It is a super-2 number, since 2×20678169² = 855173346385122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20678149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35239 + ... + 35820.

It is an arithmetic number, because the mean of its divisors is an integer number (3481940).

Almost surely, 2^20678169 is an apocalyptic number.

It is an amenable number.

20678169 is a deficient number, since it is larger than the sum of its proper divisors (7177351).

20678169 is an equidigital number, since it uses as much as digits as its factorization.

20678169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71159.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20678169 is about 4547.3254776847. The cubic root of 20678169 is about 274.4757792970.

The spelling of 20678169 in words is "twenty million, six hundred seventy-eight thousand, one hundred sixty-nine".