20629 has 6 divisors (see below), whose sum is σ = 24054. Its totient is φ = 17640.

The previous prime is 20627. The next prime is 20639. The reversal of 20629 is 92602.

It can be written as a sum of positive squares in only one way, i.e., 11025 + 9604 = 105^2 + 98^2 .

It is not a de Polignac number, because 20629 - 2¹ = 20627 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 162 + ... + 259.

It is an arithmetic number, because the mean of its divisors is an integer number (4009).

2²⁰⁶²⁹ is an apocalyptic number.

It is an amenable number.

20629 is a deficient number, since it is larger than the sum of its proper divisors (3425).

20629 is an equidigital number, since it uses as much as digits as its factorization.

20629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20629 is about 143.6279917008. The cubic root of 20629 is about 27.4258055143.

The spelling of 20629 in words is "twenty thousand, six hundred twenty-nine".