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20562 = 2323149
BaseRepresentation
bin101000001010010
31001012120
411001102
51124222
6235110
7113643
oct50122
931176
1020562
11144a3
12ba96
139489
1476ca
15615c
hex5052

20562 has 16 divisors (see below), whose sum is σ = 43200. Its totient is φ = 6512.

The previous prime is 20551. The next prime is 20563. The reversal of 20562 is 26502.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (20563) 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 7 ways as a sum of consecutive naturals, for example, 64 + ... + 212.

It is an arithmetic number, because the mean of its divisors is an integer number (2700).

220562 is an apocalyptic number.

20562 is an abundant number, since it is smaller than the sum of its proper divisors (22638).

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 (21600).

20562 is a wasteful number, since it uses less digits than its factorization.

20562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20562 is about 143.3945605663. The cubic root of 20562 is about 27.3960816319.

The spelling of 20562 in words is "twenty thousand, five hundred sixty-two".

Divisors: 1 2 3 6 23 46 69 138 149 298 447 894 3427 6854 10281 20562