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201820 = 22510091
BaseRepresentation
bin110001010001011100
3101020211211
4301101130
522424240
64154204
71500253
oct612134
9336754
10201820
111286a3
1298964
1370b28
145379a
153ebea
hex3145c

201820 has 12 divisors (see below), whose sum is σ = 423864. Its totient is φ = 80720.

The previous prime is 201809. The next prime is 201821. The reversal of 201820 is 28102.

It is a self number, because there is not a number n which added to its sum of digits gives 201820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5026 + ... + 5065.

It is an arithmetic number, because the mean of its divisors is an integer number (35322).

2201820 is an apocalyptic number.

201820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201820 is an abundant number, since it is smaller than the sum of its proper divisors (222044).

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

201820 is a wasteful number, since it uses less digits than its factorization.

201820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100 (or 10098 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 201820 is about 449.2438090837. The cubic root of 201820 is about 58.6572097934.

Adding to 201820 its reverse (28102), we get a palindrome (229922).

The spelling of 201820 in words is "two hundred one thousand, eight hundred twenty".

Divisors: 1 2 4 5 10 20 10091 20182 40364 50455 100910 201820