20678665 has 8 divisors (see below), whose sum is σ = 28359360. Its totient is φ = 14179632.

The previous prime is 20678659. The next prime is 20678677. The reversal of 20678665 is 56687602.

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 20678665 - 2¹⁹ = 20154377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295375 + ... + 295444.

It is an arithmetic number, because the mean of its divisors is an integer number (3544920).

Almost surely, 2^20678665 is an apocalyptic number.

It is an amenable number.

20678665 is a deficient number, since it is larger than the sum of its proper divisors (7680695).

20678665 is an equidigital number, since it uses as much as digits as its factorization.

20678665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590831.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 20678665 is about 4547.3800149097. The cubic root of 20678665 is about 274.4779738642.

The spelling of 20678665 in words is "twenty million, six hundred seventy-eight thousand, six hundred sixty-five".