20678369 has 8 divisors (see below), whose sum is σ = 20989800. Its totient is φ = 20369536.

The previous prime is 20678353. The next prime is 20678381. The reversal of 20678369 is 96387602.

It can be written as a sum of positive squares in 4 ways, for example, as 473344 + 20205025 = 688^2 + 4495^2 .

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 20678369 - 2⁴ = 20678353 is a prime.

It is a super-2 number, since 2×20678369² = 855189889000322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20678569) 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 7 ways as a sum of consecutive naturals, for example, 19907 + ... + 20919.

It is an arithmetic number, because the mean of its divisors is an integer number (2623725).

Almost surely, 2^20678369 is an apocalyptic number.

It is an amenable number.

20678369 is a deficient number, since it is larger than the sum of its proper divisors (311431).

20678369 is a wasteful number, since it uses less digits than its factorization.

20678369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20678369 is about 4547.3474685799. The cubic root of 20678369 is about 274.4766642073.

The spelling of 20678369 in words is "twenty million, six hundred seventy-eight thousand, three hundred sixty-nine".