20707 has 2 divisors, whose sum is σ = 20708. Its totient is φ = 20706.

The previous prime is 20693. The next prime is 20717. The reversal of 20707 is 70702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20707 is a prime.

It is a pancake number, because a pancake can be divided into 20707 parts by 203 straight cuts.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another 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 good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10353 + 10354.

It is an arithmetic number, because the mean of its divisors is an integer number (10354).

2²⁰⁷⁰⁷ is an apocalyptic number.

20707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20707 is an equidigital number, since it uses as much as digits as its factorization.

20707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98, while the sum is 16.

The square root of 20707 is about 143.8992703248. The cubic root of 20707 is about 27.4603284723.

It can be divided in two parts, 20 and 707, that added together give a palindrome (727).

The spelling of 20707 in words is "twenty thousand, seven hundred seven", and thus it is an iban number.