20268679 has 4 divisors (see below), whose sum is σ = 20279584. Its totient is φ = 20257776.

The previous prime is 20268671. The next prime is 20268691. The reversal of 20268679 is 97686202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20268679 - 2³ = 20268671 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 (20268671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887 + ... + 6640.

It is an arithmetic number, because the mean of its divisors is an integer number (5069896).

Almost surely, 2^20268679 is an apocalyptic number.

20268679 is a deficient number, since it is larger than the sum of its proper divisors (10905).

20268679 is an equidigital number, since it uses as much as digits as its factorization.

20268679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10904.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20268679 is about 4502.0749660573. The cubic root of 20268679 is about 272.6518705659.

The spelling of 20268679 in words is "twenty million, two hundred sixty-eight thousand, six hundred seventy-nine".