20678969 has 8 divisors (see below), whose sum is σ = 21102720. Its totient is φ = 20257776.

The previous prime is 20678951. The next prime is 20678981. The reversal of 20678969 is 96987602.

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 20678969 - 2¹⁶ = 20613433 is a prime.

It is a super-2 number, since 2×20678969² = 855239517805922, 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, 26939 + ... + 27695.

It is an arithmetic number, because the mean of its divisors is an integer number (2637840).

Almost surely, 2^20678969 is an apocalyptic number.

It is an amenable number.

20678969 is a deficient number, since it is larger than the sum of its proper divisors (423751).

20678969 is an equidigital number, since it uses as much as digits as its factorization.

20678969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 20678969 is about 4547.4134406275. The cubic root of 20678969 is about 274.4793189042.

The spelling of 20678969 in words is "twenty million, six hundred seventy-eight thousand, nine hundred sixty-nine".