20662 has 4 divisors (see below), whose sum is σ = 30996. Its totient is φ = 10330.

The previous prime is 20641. The next prime is 20663. The reversal of 20662 is 26602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663) by changing a digit.

20662 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5164 + ... + 5167.

It is an arithmetic number, because the mean of its divisors is an integer number (7749).

2²⁰⁶⁶² is an apocalyptic number.

20662 is a deficient number, since it is larger than the sum of its proper divisors (10334).

20662 is a wasteful number, since it uses less digits than its factorization.

20662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20662 is about 143.7428259079. The cubic root of 20662 is about 27.4404219832.

The spelling of 20662 in words is "twenty thousand, six hundred sixty-two".