20758 has 8 divisors (see below), whose sum is σ = 31752. Its totient is φ = 10176.

The previous prime is 20753. The next prime is 20759. The reversal of 20758 is 85702.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20753) 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, 141 + ... + 247.

It is an arithmetic number, because the mean of its divisors is an integer number (3969).

2²⁰⁷⁵⁸ is an apocalyptic number.

20758 is a deficient number, since it is larger than the sum of its proper divisors (10994).

20758 is a wasteful number, since it uses less digits than its factorization.

20758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20758 is about 144.0763686383. The cubic root of 20758 is about 27.4828543260.

Subtracting from 20758 its sum of digits (22), we obtain a 4-th power (20736 = 12⁴).

The spelling of 20758 in words is "twenty thousand, seven hundred fifty-eight".