20678893 has 8 divisors (see below), whose sum is σ = 21353112. Its totient is φ = 20010816.

The previous prime is 20678873. The next prime is 20678899. The reversal of 20678893 is 39887602.

It can be written as a sum of positive squares in 4 ways, for example, as 7414729 + 13264164 = 2723^2 + 3642^2 .

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 20678893 - 2⁹ = 20678381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678899) 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, 5871 + ... + 8707.

It is an arithmetic number, because the mean of its divisors is an integer number (2669139).

Almost surely, 2^20678893 is an apocalyptic number.

It is an amenable number.

20678893 is a deficient number, since it is larger than the sum of its proper divisors (674219).

20678893 is a wasteful number, since it uses less digits than its factorization.

20678893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20678893 is about 4547.4050842211. The cubic root of 20678893 is about 274.4789826455.

The spelling of 20678893 in words is "twenty million, six hundred seventy-eight thousand, eight hundred ninety-three".