20678963 has 4 divisors (see below), whose sum is σ = 20970288. Its totient is φ = 20387640.

The previous prime is 20678951. The next prime is 20678981. The reversal of 20678963 is 36987602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20678963 - 2⁶ = 20678899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20678963.

It is not an unprimeable number, because it can be changed into a prime (20678923) 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 3 ways as a sum of consecutive naturals, for example, 145556 + ... + 145697.

It is an arithmetic number, because the mean of its divisors is an integer number (5242572).

Almost surely, 2^20678963 is an apocalyptic number.

20678963 is a deficient number, since it is larger than the sum of its proper divisors (291325).

20678963 is an equidigital number, since it uses as much as digits as its factorization.

20678963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291324.

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

The square root of 20678963 is about 4547.4127809118. The cubic root of 20678963 is about 274.4792923575.

The spelling of 20678963 in words is "twenty million, six hundred seventy-eight thousand, nine hundred sixty-three".