20710 has 16 divisors (see below), whose sum is σ = 39600. Its totient is φ = 7776.

The previous prime is 20707. The next prime is 20717. The reversal of 20710 is 1702.

20710 = T₁₁₆ + T₁₁₇ + T₁₁₈.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 136 + ... + 244.

It is an arithmetic number, because the mean of its divisors is an integer number (2475).

20710 is the 118-th centered triangular number.

20710 is a deficient number, since it is larger than the sum of its proper divisors (18890).

20710 is a wasteful number, since it uses less digits than its factorization.

20710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135.

The product of its (nonzero) digits is 14, while the sum is 10.

The square root of 20710 is about 143.9096939056. The cubic root of 20710 is about 27.4616545457.

The spelling of 20710 in words is "twenty thousand, seven hundred ten", and thus it is an iban number.