20726879 has 4 divisors (see below), whose sum is σ = 21395520. Its totient is φ = 20058240.

The previous prime is 20726837. The next prime is 20726897. The reversal of 20726879 is 97862702.

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

It is a de Polignac number, because none of the positive numbers 2^k-20726879 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 (20726819) 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, 334274 + ... + 334335.

It is an arithmetic number, because the mean of its divisors is an integer number (5348880).

Almost surely, 2^20726879 is an apocalyptic number.

20726879 is a deficient number, since it is larger than the sum of its proper divisors (668641).

20726879 is an equidigital number, since it uses as much as digits as its factorization.

20726879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668640.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 20726879 is about 4552.6782227608. The cubic root of 20726879 is about 274.6911309063.

The spelling of 20726879 in words is "twenty million, seven hundred twenty-six thousand, eight hundred seventy-nine".