20620 has 12 divisors (see below), whose sum is σ = 43344. Its totient is φ = 8240.

The previous prime is 20611. The next prime is 20627. The reversal of 20620 is 2602.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 20597 and 20606.

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

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496 + ... + 535.

It is an arithmetic number, because the mean of its divisors is an integer number (3612).

2²⁰⁶²⁰ is an apocalyptic number.

20620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20620 is an abundant number, since it is smaller than the sum of its proper divisors (22724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21672).

20620 is a wasteful number, since it uses less digits than its factorization.

20620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20620 is about 143.5966573427. The cubic root of 20620 is about 27.4218164996.

The spelling of 20620 in words is "twenty thousand, six hundred twenty".