216020 has 24 divisors (see below), whose sum is σ = 518784. Its totient is φ = 74016.

The previous prime is 215983. The next prime is 216023. The reversal of 216020 is 20612.

It is a junction number, because it is equal to n+sod(n) for n = 215992 and 216010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632 + ... + 911.

It is an arithmetic number, because the mean of its divisors is an integer number (21616).

216020 is a Friedman number, since it can be written as 60^(2+1)+20, using all its digits and the basic arithmetic operations.

2²¹⁶⁰²⁰ is an apocalyptic number.

216020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216020 is an abundant number, since it is smaller than the sum of its proper divisors (302764).

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

216020 is a wasteful number, since it uses less digits than its factorization.

216020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 216020 is about 464.7795176210. The cubic root of 216020 is about 60.0018517947.

Adding to 216020 its reverse (20612), we get a palindrome (236632).

The spelling of 216020 in words is "two hundred sixteen thousand, twenty".