20678593 has 8 divisors (see below), whose sum is σ = 23441600. Its totient is φ = 18083088.

The previous prime is 20678591. The next prime is 20678629. The reversal of 20678593 is 39587602.

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 20678593 - 2¹ = 20678591 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20678591) 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, 41613 + ... + 42106.

It is an arithmetic number, because the mean of its divisors is an integer number (2930200).

Almost surely, 2^20678593 is an apocalyptic number.

It is an amenable number.

20678593 is a deficient number, since it is larger than the sum of its proper divisors (2763007).

20678593 is a wasteful number, since it uses less digits than its factorization.

20678593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83751.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20678593 is about 4547.3720982563. The cubic root of 20678593 is about 274.4776553002.

The spelling of 20678593 in words is "twenty million, six hundred seventy-eight thousand, five hundred ninety-three".