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20069 = 74761
BaseRepresentation
bin100111001100101
31000112022
410321211
51120234
6232525
7112340
oct47145
930468
1020069
1114095
12b745
13919a
147457
155e2e
hex4e65

20069 has 8 divisors (see below), whose sum is σ = 23808. Its totient is φ = 16560.

The previous prime is 20063. The next prime is 20071. The reversal of 20069 is 96002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20069 - 28 = 19813 is a prime.

It is a super-2 number, since 2×200692 = 805529522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20063) 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, 299 + ... + 359.

It is an arithmetic number, because the mean of its divisors is an integer number (2976).

220069 is an apocalyptic number.

It is an amenable number.

20069 is a deficient number, since it is larger than the sum of its proper divisors (3739).

20069 is an equidigital number, since it uses as much as digits as its factorization.

20069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 20069 is about 141.6650980305. The cubic root of 20069 is about 27.1753561390.

The spelling of 20069 in words is "twenty thousand, sixty-nine".

Divisors: 1 7 47 61 329 427 2867 20069