20726 has 8 divisors (see below), whose sum is σ = 31944. Its totient is φ = 10080.

The previous prime is 20719. The next prime is 20731. The reversal of 20726 is 62702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

20726 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 206.

It is an arithmetic number, because the mean of its divisors is an integer number (3993).

2²⁰⁷²⁶ is an apocalyptic number.

20726 is a deficient number, since it is larger than the sum of its proper divisors (11218).

20726 is a wasteful number, since it uses less digits than its factorization.

20726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20726 is about 143.9652735905. The cubic root of 20726 is about 27.4687247753.

The spelling of 20726 in words is "twenty thousand, seven hundred twenty-six".